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Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}],"research_interests":[{"id":40276,"name":"Proceedings","url":"https://www.academia.edu/Documents/in/Proceedings","nofollow":false}],"publication_year":2001,"publication_year_with_fallback":2001,"paper_rank":null,"all_time_views":18,"active_discussion":{}}, }) } })();</script></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357345" data-work_id="2357345" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357345/The_manchester_isolab_54_ion_microprobe">The manchester isolab 54 ion microprobe</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest"><div class="summarized">The Isolab 54 ion microprobe installed at the Department of Earth Sciences at the University of Manchester has been designed to measure isotopic abundances of elements with high precision from ions formed by secondary ionisation (SIMS),... <a class="more_link u-tcGrayDark u-linkUnstyled" data-container=".work_2357345" data-show=".complete" data-hide=".summarized" data-more-link-behavior="true" href="#">more</a></div><div class="complete hidden">The Isolab 54 ion microprobe installed at the Department of Earth Sciences at the University of Manchester has been designed to measure isotopic abundances of elements with high precision from ions formed by secondary ionisation (SIMS), laser resonance ionisation (RIMS) or thermal ionisation (TIMS). This instrument has been extensively modified since its original installation to improve its precision and capabilities, and these improvements are detailed, as are applications for which the instrument has been used. The principal modifications were the installation and testing of a new type of ion detector (conversion dynode system, CDS), which has an ion-to-pulse conversion efficiency that has been constant to better than 2% over periods of many months, a method of integrating secondary ion currents to eliminate the effects of irreproducible instrumental isotopic fractionation, and a method of rapid electrostatic peak centring which can centre high mass resolution peaks on a detector to a precision of 2 ppm in mass in 1.2 s.Particular attention has been paid to in situ SIMS analysis of oxygen isotopes from insulating materials, where a spatial resolution of 10–20 μm with a precision of 1–2% has been achieved for both 17O/16O and 18O/16O. Analytical techniques for the measurement of carbon, nitrogen and osmium isotope ratios by SIMS are also described, together with the development of a technique for the measurement of strontium isotope ratios using laser resonance ionisation of sputtered neutral atoms.</div></div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357345" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="00ca5cdd6e5a7de2823110d6dfc95620" rel="nofollow" data-download="{"attachment_id":50660200,"asset_id":2357345,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" href="https://www.academia.edu/attachments/50660200/download_file?st=MTczMjc1NjM1MSw4LjIyMi4yMDguMTQ2&s=work_strip"><i class="fa fa-arrow-circle-o-down fa-lg"></i><span class="u-textUppercase u-ml1x" data-content="button_text">Download</span></a></div></li><li class="InlineList-item"><ul class="InlineList InlineList--bordered u-ph0x"><li class="InlineList-item InlineList-item--bordered"><span class="InlineList-item-text">by <span itemscope="itemscope" itemprop="author" itemtype="https://schema.org/Person"><a class="u-tcGrayDark u-fw700" data-has-card-for-user="195104" href="https://ntua.academia.edu/EliasChatzitheodoridis">Elias Chatzitheodoridis</a><script data-card-contents-for-user="195104" type="text/json">{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}</script></span></span></li><li class="js-paper-rank-work_2357345 InlineList-item InlineList-item--bordered hidden"><span class="js-paper-rank-view hidden u-tcGrayDark" data-paper-rank-work-id="2357345"><i class="u-m1x fa fa-bar-chart"></i><strong class="js-paper-rank"></strong></span><script>$(function() { new Works.PaperRankView({ workId: 2357345, container: ".js-paper-rank-work_2357345", }); 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This instrument has been extensively modified since its original installation to improve its precision and capabilities, and these improvements are detailed, as are applications for which the instrument has been used. The principal modifications were the installation and testing of a new type of ion detector (conversion dynode system, CDS), which has an ion-to-pulse conversion efficiency that has been constant to better than 2% over periods of many months, a method of integrating secondary ion currents to eliminate the effects of irreproducible instrumental isotopic fractionation, and a method of rapid electrostatic peak centring which can centre high mass resolution peaks on a detector to a precision of 2 ppm in mass in 1.2 s.Particular attention has been paid to in situ SIMS analysis of oxygen isotopes from insulating materials, where a spatial resolution of 10–20 μm with a precision of 1–2% has been achieved for both 17O/16O and 18O/16O. Analytical techniques for the measurement of carbon, nitrogen and osmium isotope ratios by SIMS are also described, together with the development of a technique for the measurement of strontium isotope ratios using laser resonance ionisation of sputtered neutral atoms.","publication":"International Journal of Mass Spectrometry and Ion Processes","publication_with_fallback":"International Journal of Mass Spectrometry and Ion 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Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}],"research_interests":[{"id":524,"name":"Analytical Chemistry","url":"https://www.academia.edu/Documents/in/Analytical_Chemistry","nofollow":false},{"id":531,"name":"Organic Chemistry","url":"https://www.academia.edu/Documents/in/Organic_Chemistry","nofollow":false},{"id":5769,"name":"Mass Spectrometry","url":"https://www.academia.edu/Documents/in/Mass_Spectrometry","nofollow":false},{"id":151091,"name":"Nitrogen","url":"https://www.academia.edu/Documents/in/Nitrogen","nofollow":false},{"id":275177,"name":"Oxygen Isotope","url":"https://www.academia.edu/Documents/in/Oxygen_Isotope"},{"id":604200,"name":"Spatial resolution","url":"https://www.academia.edu/Documents/in/Spatial_resolution"},{"id":640682,"name":"Isotope fractionation","url":"https://www.academia.edu/Documents/in/Isotope_fractionation"},{"id":832985,"name":"Strontium Isotopes","url":"https://www.academia.edu/Documents/in/Strontium_Isotopes"},{"id":1400376,"name":"Conversion Efficiency","url":"https://www.academia.edu/Documents/in/Conversion_Efficiency"}],"publication_year":1996,"publication_year_with_fallback":1996,"paper_rank":null,"all_time_views":27,"active_discussion":{}}, }) } })();</script></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357348" data-work_id="2357348" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357348/High_Calcium_80mol_Late_Stage_Carbonate_in_ALH84001">High Calcium (~80mol%) Late Stage Carbonate in ALH84001</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest">Brief petrological, chemical and textural description of previously undescribed high Ca late stage carbonate in Martian meteorite ALH84001. This carbonate surrounds Mg rich carbonates and rosette fragments.</div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357348" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="e5dcad79817c1f001147d3bbf614cc2f" rel="nofollow" data-download="{"attachment_id":50660190,"asset_id":2357348,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" 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Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}],"research_interests":[{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology","nofollow":false},{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry","nofollow":false}],"publication_year":1997,"publication_year_with_fallback":1997,"paper_rank":null,"all_time_views":10,"active_discussion":{}}, }) } })();</script></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357354" data-work_id="2357354" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357354/Precision_and_reproducibility_of_in_situ_oxygen_isotope_ratio_measurements_on_quartz_obtained_using_an_Isolab_54_ion_microprobe">Precision and reproducibility of in situ oxygen isotope ratio measurements on quartz obtained using an Isolab 54 ion microprobe</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest"><div class="summarized">Ion probe techniques for measuring in situ 18O/16O ratios from insulating materials (particularly quartz) have been developed using an Isolab 54 ion microprobe. 18O/16O ratio measurements were obtained from a range of quartz standards for... <a class="more_link u-tcGrayDark u-linkUnstyled" data-container=".work_2357354" data-show=".complete" data-hide=".summarized" data-more-link-behavior="true" href="#">more</a></div><div class="complete hidden">Ion probe techniques for measuring in situ 18O/16O ratios from insulating materials (particularly quartz) have been developed using an Isolab 54 ion microprobe. 18O/16O ratio measurements were obtained from a range of quartz standards for which 18O/16OSMOW ratios had been determined by conventional fluorination techniques. The correlation between the ratios obtained by ion probe and by conventional fluorination methods is high. Accurate absolute 18O/16OSMOW ratios can be obtained by normalisation to a well-characterised standard and the 1s deviation between the ion probe ratio and the conventionally determined ratio is 1.5‰ for a single measurement on the standard and a single measurement on the unknown sample. This measured scatter in normalised ratios is consistent with the typical measured uncertainty on a spot measurement being of the order of 1‰ and the uncertainty in the absolute ratio being derived from uncertainties added in quadrature. The data show no large systematic errors, demonstrating that the trueness of the mean of a number of ion probe determined ratios may be improved by repeated measurements.Detector stability and instrumental fractionation yield measured ratios (absolute in the sense that they are not normalised from day to day) which show a scatter of between 1 and 2‰ over periods of many weeks, an instrument stability which is an order of magnitude better than data published elsewhere. This level of stability opens the possibility of “standardless” ion probe oxygen isotope ratio measurements, certainly to an accuracy of 2‰ or better.</div></div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357354" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="feed6b451f7fcaf300b2d13fad289d7b" rel="nofollow" data-download="{"attachment_id":50660188,"asset_id":2357354,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" href="https://www.academia.edu/attachments/50660188/download_file?st=MTczMjc1NjM1MSw4LjIyMi4yMDguMTQ2&s=work_strip"><i class="fa fa-arrow-circle-o-down fa-lg"></i><span class="u-textUppercase u-ml1x" data-content="button_text">Download</span></a></div></li><li class="InlineList-item"><ul class="InlineList InlineList--bordered u-ph0x"><li class="InlineList-item InlineList-item--bordered"><span class="InlineList-item-text">by <span itemscope="itemscope" itemprop="author" itemtype="https://schema.org/Person"><a class="u-tcGrayDark u-fw700" data-has-card-for-user="195104" href="https://ntua.academia.edu/EliasChatzitheodoridis">Elias Chatzitheodoridis</a><script data-card-contents-for-user="195104" type="text/json">{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}</script></span></span></li><li class="js-paper-rank-work_2357354 InlineList-item InlineList-item--bordered hidden"><span class="js-paper-rank-view hidden u-tcGrayDark" data-paper-rank-work-id="2357354"><i class="u-m1x fa fa-bar-chart"></i><strong class="js-paper-rank"></strong></span><script>$(function() { new Works.PaperRankView({ workId: 2357354, container: ".js-paper-rank-work_2357354", }); });</script></li><li class="js-percentile-work_2357354 InlineList-item InlineList-item--bordered hidden u-tcGrayDark"><span class="percentile-widget hidden"><span class="u-mr2x percentile-widget" style="display: none">•</span><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 2357354; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-percentile-work_2357354"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></li><li class="js-view-count-work_2357354 InlineList-item InlineList-item--bordered hidden"><div><span><span class="js-view-count view-count u-mr2x" data-work-id="2357354"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 2357354; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=2357354]").text(description); $(".js-view-count-work_2357354").attr('title', description).tooltip(); }); });</script></span><script>$(function() { $(".js-view-count-work_2357354").removeClass('hidden') })</script></div></li><li class="InlineList-item u-positionRelative" style="max-width: 250px"><div class="u-positionAbsolute" data-has-card-for-ri-list="2357354"><i class="fa fa-tag InlineList-item-icon u-positionRelative"></i></div><span class="InlineList-item-text u-textTruncate u-pl6x"><a class="InlineList-item-text" data-has-card-for-ri="275177" href="https://www.academia.edu/Documents/in/Oxygen_Isotope">Oxygen Isotope</a><script data-card-contents-for-ri="275177" type="text/json">{"id":275177,"name":"Oxygen Isotope","url":"https://www.academia.edu/Documents/in/Oxygen_Isotope","nofollow":false}</script></span></li><script>(function(){ if (false) { new Aedu.ResearchInterestListCard({ el: $('*[data-has-card-for-ri-list=2357354]'), work: {"id":2357354,"title":"Precision and reproducibility of in situ oxygen isotope ratio measurements on quartz obtained using an Isolab 54 ion microprobe","created_at":"2013-01-03T13:58:06.319-08:00","owner_id":195104,"url":"https://www.academia.edu/2357354/Precision_and_reproducibility_of_in_situ_oxygen_isotope_ratio_measurements_on_quartz_obtained_using_an_Isolab_54_ion_microprobe","slug":"Precision_and_reproducibility_of_in_situ_oxygen_isotope_ratio_measurements_on_quartz_obtained_using_an_Isolab_54_ion_microprobe","dom_id":"work_2357354","summary":"Ion probe techniques for measuring in situ 18O/16O ratios from insulating materials (particularly quartz) have been developed using an Isolab 54 ion microprobe. 18O/16O ratio measurements were obtained from a range of quartz standards for which 18O/16OSMOW ratios had been determined by conventional fluorination techniques. The correlation between the ratios obtained by ion probe and by conventional fluorination methods is high. Accurate absolute 18O/16OSMOW ratios can be obtained by normalisation to a well-characterised standard and the 1s deviation between the ion probe ratio and the conventionally determined ratio is 1.5‰ for a single measurement on the standard and a single measurement on the unknown sample. This measured scatter in normalised ratios is consistent with the typical measured uncertainty on a spot measurement being of the order of 1‰ and the uncertainty in the absolute ratio being derived from uncertainties added in quadrature. The data show no large systematic errors, demonstrating that the trueness of the mean of a number of ion probe determined ratios may be improved by repeated measurements.Detector stability and instrumental fractionation yield measured ratios (absolute in the sense that they are not normalised from day to day) which show a scatter of between 1 and 2‰ over periods of many weeks, an instrument stability which is an order of magnitude better than data published elsewhere. This level of stability opens the possibility of “standardless” ion probe oxygen isotope ratio measurements, certainly to an accuracy of 2‰ or better.","publication":"International Journal of Mass Spectrometry and Ion Processes","publication_with_fallback":"International Journal of Mass Spectrometry and Ion Processes","downloadable_attachments":[{"id":50660188,"asset_id":2357354,"asset_type":"Work","always_allow_download":false,"scribd_thumbnail_url":"https://attachments.academia-assets.com/50660188/thumbnails/1.jpg","download_url":"https://d1wqtxts1xzle7.cloudfront.net/50660188/0168-1176_2895_2904304-720161201-12236-1cp4ia-libre.pdf?1480609495=\u0026response-content-disposition=attachment%3B+filename%3DPrecision_and_reproducibility_of_in_situ.pdf\u0026Expires=1731062882\u0026Signature=DbSz0zg4HkDmhL2Wedaeu5L3WhauCaDPnAfQkSivs0X-M1sHIqM-Rsst-PuyHfyX~ptPtNY5PCSq-0JLy-~MoH990OC7e7ldOYshuO4vSztuo6tuM7LX0XxiUt~3XII5AHRJVhQzTTsvldWc~iD~2cAPqHBF4GrWtgrKr4Wz~dlJ28Ybx1Akf5Y8sBukarqRqBK5FGgn3wRUybzYT8yL5GF98U4R6fs6mhVYoy~KwKD56eqsQjn4KNeZD~zturEgb7uTiHPbzJxVu7yR4UR9j5-mE3S7Shnw4oE9CI3Kyc707Ng5G3lBLlSKUb28jgXRXyQWUtT~ABtOvZbRP4mZWg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA","download_file_url":"https://www.academia.edu/attachments/50660188/download_file?st=MTczMjc1NjM1MSw4LjIyMi4yMDguMTQ2&","full_thumbnail_url":"https://0.academia-photos.com/attachment_thumbnails/50660188/mini_magick20190128-4732-1odgkvr.png?1548685858"}],"downloadable_attachments_with_full_thumbnails":[{"id":50660188,"asset_id":2357354,"asset_type":"Work","always_allow_download":false,"scribd_thumbnail_url":"https://attachments.academia-assets.com/50660188/thumbnails/1.jpg","download_url":"https://d1wqtxts1xzle7.cloudfront.net/50660188/0168-1176_2895_2904304-720161201-12236-1cp4ia-libre.pdf?1480609495=\u0026response-content-disposition=attachment%3B+filename%3DPrecision_and_reproducibility_of_in_situ.pdf\u0026Expires=1731062882\u0026Signature=DbSz0zg4HkDmhL2Wedaeu5L3WhauCaDPnAfQkSivs0X-M1sHIqM-Rsst-PuyHfyX~ptPtNY5PCSq-0JLy-~MoH990OC7e7ldOYshuO4vSztuo6tuM7LX0XxiUt~3XII5AHRJVhQzTTsvldWc~iD~2cAPqHBF4GrWtgrKr4Wz~dlJ28Ybx1Akf5Y8sBukarqRqBK5FGgn3wRUybzYT8yL5GF98U4R6fs6mhVYoy~KwKD56eqsQjn4KNeZD~zturEgb7uTiHPbzJxVu7yR4UR9j5-mE3S7Shnw4oE9CI3Kyc707Ng5G3lBLlSKUb28jgXRXyQWUtT~ABtOvZbRP4mZWg__\u0026Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA","download_file_url":"https://www.academia.edu/attachments/50660188/download_file?st=MTczMjc1NjM1MSw4LjIyMi4yMDguMTQ2&","full_thumbnail_url":"https://0.academia-photos.com/attachment_thumbnails/50660188/mini_magick20190128-4732-1odgkvr.png?1548685858"}],"has_pdf":true,"has_fulltext":true,"page_count":16,"ordered_authors":[{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}],"research_interests":[{"id":275177,"name":"Oxygen Isotope","url":"https://www.academia.edu/Documents/in/Oxygen_Isotope","nofollow":false}],"publication_year":1995,"publication_year_with_fallback":1995,"paper_rank":null,"all_time_views":10,"active_discussion":{}}, }) } })();</script></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357355" data-work_id="2357355" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357355/Oxygen_isotopic_composition_of_carbonate_in_the_nakhla_meteorite_implications_for_the_hydrosphere_and_atmosphere_of_mars">Oxygen isotopic composition of carbonate in the nakhla meteorite: implications for the hydrosphere and atmosphere of mars</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest"><div class="summarized">We have located small areas of siderite within the mesostasis of the Nakhla meteorite. High concentrations of Mn (up to ∼50% rhodochrosite) and elevated D/H ratios indicate that the siderite is not a terrestrial alteration product. The... <a class="more_link u-tcGrayDark u-linkUnstyled" data-container=".work_2357355" data-show=".complete" data-hide=".summarized" data-more-link-behavior="true" href="#">more</a></div><div class="complete hidden">We have located small areas of siderite within the mesostasis of the Nakhla meteorite. High concentrations of Mn (up to ∼50% rhodochrosite) and elevated D/H ratios indicate that the siderite is not a terrestrial alteration product. The isotopic composition of oxygen in the siderite has been determined with the Manchester ISOLAB 54 ion microprobe. The siderite has δ18O = +34 ± 1‰, which is higher than any other martian carbonate yet reported. If the δ18O value is the result of equilibration with water at <60°C, then the carbonate could have formed from CO2/H2O produced during the degassing of Mars, and not modified subsequently isotopically. Formation from a water rich fluid at >60°C requires that the fluid was heavy isotope enriched relative to fluids produced during planetary degassing. An enrichment of 8–15‰ is consistent with theoretical outgassing models that are able to account for enhancements of Δ17O in martian alteration products. Estimated deposition temperatures would be raised to 80–170°C. The effect of a global scale fixation of martian CO2 as carbonate operates in the opposite direction and could lead to a reduction in δ18O of the martian hydrosphere of a few permil.</div></div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357355" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="4a6cea64c3f96881b414b607ea20edb2" rel="nofollow" data-download="{"attachment_id":50660194,"asset_id":2357355,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" href="https://www.academia.edu/attachments/50660194/download_file?st=MTczMjc1NjM1Miw4LjIyMi4yMDguMTQ2&s=work_strip"><i class="fa fa-arrow-circle-o-down fa-lg"></i><span class="u-textUppercase u-ml1x" data-content="button_text">Download</span></a></div></li><li class="InlineList-item"><ul class="InlineList InlineList--bordered u-ph0x"><li class="InlineList-item InlineList-item--bordered"><span class="InlineList-item-text">by <span itemscope="itemscope" itemprop="author" itemtype="https://schema.org/Person"><a class="u-tcGrayDark u-fw700" data-has-card-for-user="195104" href="https://ntua.academia.edu/EliasChatzitheodoridis">Elias Chatzitheodoridis</a><script data-card-contents-for-user="195104" type="text/json">{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}</script></span></span></li><li class="js-paper-rank-work_2357355 InlineList-item InlineList-item--bordered hidden"><span class="js-paper-rank-view hidden u-tcGrayDark" data-paper-rank-work-id="2357355"><i class="u-m1x fa fa-bar-chart"></i><strong class="js-paper-rank"></strong></span><script>$(function() { new Works.PaperRankView({ workId: 2357355, container: ".js-paper-rank-work_2357355", }); });</script></li><li class="js-percentile-work_2357355 InlineList-item InlineList-item--bordered hidden u-tcGrayDark"><span class="percentile-widget hidden"><span class="u-mr2x percentile-widget" style="display: none">•</span><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 2357355; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-percentile-work_2357355"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></li><li class="js-view-count-work_2357355 InlineList-item InlineList-item--bordered hidden"><div><span><span class="js-view-count view-count u-mr2x" data-work-id="2357355"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 2357355; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=2357355]").text(description); $(".js-view-count-work_2357355").attr('title', description).tooltip(); }); });</script></span><script>$(function() { $(".js-view-count-work_2357355").removeClass('hidden') })</script></div></li><li class="InlineList-item u-positionRelative" style="max-width: 250px"><div class="u-positionAbsolute" data-has-card-for-ri-list="2357355"><i class="fa fa-tag InlineList-item-icon u-positionRelative"></i> <a class="InlineList-item-text u-positionRelative">2</a> </div><span class="InlineList-item-text u-textTruncate u-pl9x"><a class="InlineList-item-text" data-has-card-for-ri="406" href="https://www.academia.edu/Documents/in/Geology">Geology</a>, <script data-card-contents-for-ri="406" type="text/json">{"id":406,"name":"Geology","url":"https://www.academia.edu/Documents/in/Geology","nofollow":false}</script><a class="InlineList-item-text" data-has-card-for-ri="407" href="https://www.academia.edu/Documents/in/Geochemistry">Geochemistry</a><script data-card-contents-for-ri="407" type="text/json">{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry","nofollow":false}</script></span></li><script>(function(){ if (true) { new Aedu.ResearchInterestListCard({ el: $('*[data-has-card-for-ri-list=2357355]'), work: {"id":2357355,"title":"Oxygen isotopic composition of carbonate in the nakhla meteorite: implications for the hydrosphere and atmosphere of mars","created_at":"2013-01-03T13:58:06.575-08:00","owner_id":195104,"url":"https://www.academia.edu/2357355/Oxygen_isotopic_composition_of_carbonate_in_the_nakhla_meteorite_implications_for_the_hydrosphere_and_atmosphere_of_mars","slug":"Oxygen_isotopic_composition_of_carbonate_in_the_nakhla_meteorite_implications_for_the_hydrosphere_and_atmosphere_of_mars","dom_id":"work_2357355","summary":"We have located small areas of siderite within the mesostasis of the Nakhla meteorite. High concentrations of Mn (up to ∼50% rhodochrosite) and elevated D/H ratios indicate that the siderite is not a terrestrial alteration product. The isotopic composition of oxygen in the siderite has been determined with the Manchester ISOLAB 54 ion microprobe. The siderite has δ18O = +34 ± 1‰, which is higher than any other martian carbonate yet reported. If the δ18O value is the result of equilibration with water at \u003c60°C, then the carbonate could have formed from CO2/H2O produced during the degassing of Mars, and not modified subsequently isotopically. Formation from a water rich fluid at \u003e60°C requires that the fluid was heavy isotope enriched relative to fluids produced during planetary degassing. An enrichment of 8–15‰ is consistent with theoretical outgassing models that are able to account for enhancements of Δ17O in martian alteration products. Estimated deposition temperatures would be raised to 80–170°C. The effect of a global scale fixation of martian CO2 as carbonate operates in the opposite direction and could lead to a reduction in δ18O of the martian hydrosphere of a few permil.","publication":"Geochimica Et Cosmochimica Acta","publication_with_fallback":"Geochimica Et Cosmochimica 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Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}],"research_interests":[{"id":48,"name":"Engineering","url":"https://www.academia.edu/Documents/in/Engineering","nofollow":false},{"id":9138,"name":"Applied Physics","url":"https://www.academia.edu/Documents/in/Applied_Physics","nofollow":false},{"id":118582,"name":"Physical sciences","url":"https://www.academia.edu/Documents/in/Physical_sciences","nofollow":false}],"publication_year":1999,"publication_year_with_fallback":1999,"paper_rank":null,"all_time_views":11,"active_discussion":{}}, }) } })();</script></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357364" data-work_id="2357364" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357364/Development_of_a_micromanipulation_system_for_special_applications_in_handling_of_microcomponents">Development of a micromanipulation system for special applications in handling of microcomponents</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest"><div class="summarized">A prototype system for handling, assembly and testing of microcomponents is described and demonstrated. The system is specially designed to fit inside the SEM chamber and operate under vacuum conditions but operation under an optical... <a class="more_link u-tcGrayDark u-linkUnstyled" data-container=".work_2357364" data-show=".complete" data-hide=".summarized" data-more-link-behavior="true" href="#">more</a></div><div class="complete hidden">A prototype system for handling, assembly and testing of microcomponents is described and demonstrated. The system is specially designed to fit inside the SEM chamber and operate under vacuum conditions but operation under an optical microscope, in atmospheric conditions, is also possible. The combination of servomotors and piezo-elements allow for a fast and precise positioning of the microparts at the submicron level</div></div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357364" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="508cd00379e98d5e09af7b301d59e6ac" rel="nofollow" data-download="{"attachment_id":50660182,"asset_id":2357364,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" href="https://www.academia.edu/attachments/50660182/download_file?st=MTczMjc1NjM1Miw4LjIyMi4yMDguMTQ2&s=work_strip"><i class="fa fa-arrow-circle-o-down fa-lg"></i><span class="u-textUppercase u-ml1x" data-content="button_text">Download</span></a></div></li><li class="InlineList-item"><ul class="InlineList InlineList--bordered u-ph0x"><li class="InlineList-item InlineList-item--bordered"><span class="InlineList-item-text">by <span itemscope="itemscope" itemprop="author" itemtype="https://schema.org/Person"><a class="u-tcGrayDark u-fw700" data-has-card-for-user="195104" href="https://ntua.academia.edu/EliasChatzitheodoridis">Elias Chatzitheodoridis</a><script data-card-contents-for-user="195104" type="text/json">{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}</script></span></span></li><li class="js-paper-rank-work_2357364 InlineList-item InlineList-item--bordered hidden"><span class="js-paper-rank-view hidden u-tcGrayDark" data-paper-rank-work-id="2357364"><i class="u-m1x fa fa-bar-chart"></i><strong class="js-paper-rank"></strong></span><script>$(function() { new Works.PaperRankView({ workId: 2357364, container: ".js-paper-rank-work_2357364", }); });</script></li><li class="js-percentile-work_2357364 InlineList-item InlineList-item--bordered hidden u-tcGrayDark"><span class="percentile-widget hidden"><span class="u-mr2x percentile-widget" style="display: none">•</span><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 2357364; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-percentile-work_2357364"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></li><li class="js-view-count-work_2357364 InlineList-item InlineList-item--bordered hidden"><div><span><span class="js-view-count view-count u-mr2x" data-work-id="2357364"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 2357364; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=2357364]").text(description); $(".js-view-count-work_2357364").attr('title', description).tooltip(); }); });</script></span><script>$(function() { $(".js-view-count-work_2357364").removeClass('hidden') })</script></div></li></ul></li></ul></div></div><div class="u-borderBottom1 u-borderColorGrayLighter"><div class="clearfix u-pv7x u-mb0x js-work-card work_2357366" data-work_id="2357366" itemscope="itemscope" itemtype="https://schema.org/ScholarlyArticle"><div class="header"><div class="title u-fontSerif u-fs22 u-lineHeight1_3"><a class="u-tcGrayDarkest js-work-link" href="https://www.academia.edu/2357366/Spectroscopic_characterization_of_Greek_dolomitic_marble_surface_interacted_with_uranium_and_thorium_in_aqueous_solutions">Spectroscopic characterization of Greek dolomitic marble surface interacted with uranium and thorium in aqueous solutions</a></div></div><div class="u-pb4x u-mt3x"><div class="summary u-fs14 u-fw300 u-lineHeight1_5 u-tcGrayDarkest"><div class="summarized">The surface of a typical Greek (Thassian) dolomitic marble was studied after interaction with U- and Th-containing aqueous solutions (1000 mg/L, free-drift experiments for 1 week at atmospheric PCO2PCO2), using 12C-RBS and Laser μ-Raman... <a class="more_link u-tcGrayDark u-linkUnstyled" data-container=".work_2357366" data-show=".complete" data-hide=".summarized" data-more-link-behavior="true" href="#">more</a></div><div class="complete hidden">The surface of a typical Greek (Thassian) dolomitic marble was studied after interaction with U- and Th-containing aqueous solutions (1000 mg/L, free-drift experiments for 1 week at atmospheric PCO2PCO2), using 12C-RBS and Laser μ-Raman spectroscopy. Powder-XRD and SEM-EDS were also applied to investigate the phases deposited on the surface of the interacted samples. The obtained results indicated a considerable removal of U from the aqueous medium mainly due to massive surface precipitation of amorphous UO2-hydroxide phases forming a relatively thick (μm-sized) coating on the carbonate substrate. The interaction of Th with dolomitic marble surface is also intense leading to a formation of an amorphous Th-hydroxide layer of similar thickness but of significantly lower elemental atomic proportion.</div></div></div><ul class="InlineList u-ph0x u-fs13"><li class="InlineList-item logged_in_only"><div class="share_on_academia_work_button"><a class="academia_share Button Button--inverseBlue Button--sm js-bookmark-button" data-academia-share="Work/2357366" data-share-source="work_strip" data-spinner="small_white_hide_contents"><i class="fa fa-plus"></i><span class="work-strip-link-text u-ml1x" data-content="button_text">Bookmark</span></a></div></li><li class="InlineList-item"><div class="download"><a id="3fd3a973aafc4366513144c7a064a39d" rel="nofollow" data-download="{"attachment_id":50660179,"asset_id":2357366,"asset_type":"Work","always_allow_download":false,"track":null,"button_location":"work_strip","source":null,"hide_modal":null}" class="Button Button--sm Button--inverseGreen js-download-button prompt_button doc_download" href="https://www.academia.edu/attachments/50660179/download_file?st=MTczMjc1NjM1Miw4LjIyMi4yMDguMTQ2&s=work_strip"><i class="fa fa-arrow-circle-o-down fa-lg"></i><span class="u-textUppercase u-ml1x" data-content="button_text">Download</span></a></div></li><li class="InlineList-item"><ul class="InlineList InlineList--bordered u-ph0x"><li class="InlineList-item InlineList-item--bordered"><span class="InlineList-item-text">by <span itemscope="itemscope" itemprop="author" itemtype="https://schema.org/Person"><a class="u-tcGrayDark u-fw700" data-has-card-for-user="195104" href="https://ntua.academia.edu/EliasChatzitheodoridis">Elias Chatzitheodoridis</a><script data-card-contents-for-user="195104" type="text/json">{"id":195104,"first_name":"Elias","last_name":"Chatzitheodoridis","domain_name":"ntua","page_name":"EliasChatzitheodoridis","display_name":"Elias Chatzitheodoridis","profile_url":"https://ntua.academia.edu/EliasChatzitheodoridis","photo":"https://0.academia-photos.com/195104/1189444/1490450/s65_elias.chatzitheodoridis.jpg"}</script></span></span></li><li class="js-paper-rank-work_2357366 InlineList-item InlineList-item--bordered hidden"><span class="js-paper-rank-view hidden u-tcGrayDark" data-paper-rank-work-id="2357366"><i class="u-m1x fa fa-bar-chart"></i><strong class="js-paper-rank"></strong></span><script>$(function() { new Works.PaperRankView({ workId: 2357366, container: ".js-paper-rank-work_2357366", }); });</script></li><li class="js-percentile-work_2357366 InlineList-item InlineList-item--bordered hidden u-tcGrayDark"><span class="percentile-widget hidden"><span class="u-mr2x percentile-widget" style="display: none">•</span><span class="u-mr2x work-percentile"></span></span><script>$(function () { var workId = 2357366; window.Academia.workPercentilesFetcher.queue(workId, function (percentileText) { var container = $(".js-percentile-work_2357366"); container.find('.work-percentile').text(percentileText.charAt(0).toUpperCase() + percentileText.slice(1)); container.find('.percentile-widget').show(); container.find('.percentile-widget').removeClass('hidden'); }); });</script></li><li class="js-view-count-work_2357366 InlineList-item InlineList-item--bordered hidden"><div><span><span class="js-view-count view-count u-mr2x" data-work-id="2357366"><i class="fa fa-spinner fa-spin"></i></span><script>$(function () { var workId = 2357366; window.Academia.workViewCountsFetcher.queue(workId, function (count) { var description = window.$h.commaizeInt(count) + " " + window.$h.pluralize(count, 'View'); $(".js-view-count[data-work-id=2357366]").text(description); $(".js-view-count-work_2357366").attr('title', description).tooltip(); }); });</script></span><script>$(function() { $(".js-view-count-work_2357366").removeClass('hidden') })</script></div></li><li class="InlineList-item u-positionRelative" style="max-width: 250px"><div class="u-positionAbsolute" data-has-card-for-ri-list="2357366"><i class="fa fa-tag InlineList-item-icon u-positionRelative"></i> <a class="InlineList-item-text u-positionRelative">2</a> </div><span class="InlineList-item-text u-textTruncate u-pl9x"><a class="InlineList-item-text" data-has-card-for-ri="407" href="https://www.academia.edu/Documents/in/Geochemistry">Geochemistry</a>, <script data-card-contents-for-ri="407" type="text/json">{"id":407,"name":"Geochemistry","url":"https://www.academia.edu/Documents/in/Geochemistry","nofollow":false}</script><a class="InlineList-item-text" data-has-card-for-ri="554780" href="https://www.academia.edu/Documents/in/Interdisciplinary_Engineering">Interdisciplinary Engineering</a><script data-card-contents-for-ri="554780" type="text/json">{"id":554780,"name":"Interdisciplinary Engineering","url":"https://www.academia.edu/Documents/in/Interdisciplinary_Engineering","nofollow":false}</script></span></li><script>(function(){ if (true) { new Aedu.ResearchInterestListCard({ el: $('*[data-has-card-for-ri-list=2357366]'), work: {"id":2357366,"title":"Spectroscopic characterization of Greek dolomitic marble surface interacted with uranium and thorium in aqueous solutions","created_at":"2013-01-03T13:58:10.186-08:00","owner_id":195104,"url":"https://www.academia.edu/2357366/Spectroscopic_characterization_of_Greek_dolomitic_marble_surface_interacted_with_uranium_and_thorium_in_aqueous_solutions","slug":"Spectroscopic_characterization_of_Greek_dolomitic_marble_surface_interacted_with_uranium_and_thorium_in_aqueous_solutions","dom_id":"work_2357366","summary":"The surface of a typical Greek (Thassian) dolomitic marble was studied after interaction with U- and Th-containing aqueous solutions (1000 mg/L, free-drift experiments for 1 week at atmospheric PCO2PCO2), using 12C-RBS and Laser μ-Raman spectroscopy. Powder-XRD and SEM-EDS were also applied to investigate the phases deposited on the surface of the interacted samples. The obtained results indicated a considerable removal of U from the aqueous medium mainly due to massive surface precipitation of amorphous UO2-hydroxide phases forming a relatively thick (μm-sized) coating on the carbonate substrate. 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