THz spectroscopy could help explain water's anomalies -- ScienceDaily

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id="source">American Institute of Physics</dd> <dt>Summary:</dt> <dd id="abstract">Liquid water sustains life on earth, but its physical properties remain mysterious among scientific researchers. Recently, a team of researchers used existing THz spectroscopy techniques to measure liquid water's hydrogen bonding. Future efforts with this technique could one day help explain water's peculiar properties. </dd> <dt class="no-print">Share:</dt> <dd class="no-print"> <div id="share_top"> <div data-url="https://web.archive.org/web/20180628213637oe_/https://www.sciencedaily.com/releases/2018/06/180627160224.htm" class="ssk-sm ssk-group"> <a class="ssk ssk-icon ssk-facebook"></a> <a class="ssk ssk-icon ssk-twitter"></a> <a class="ssk ssk-icon ssk-google-plus"></a> <a class="ssk ssk-icon ssk-pinterest"></a> <a class="ssk ssk-icon ssk-linkedin"></a> <a class="ssk ssk-icon ssk-email"></a> </div> </div> </dd> </dl> <div class="row"> <div class="col-md-8 col-md-push-4"> <div class="fullstory">FULL STORY</div> <hr class="hr-fullstory"/> <div id="story_photo" class="hyphenate"> <div class="photo-image"><img class="img-responsive center-block" src="/web/20180628213637im_/https://www.sciencedaily.com/images/2018/06/180627160224_1_540x360.jpg" width="378.68852459016" height="360" title="Click to enlarge" alt="" data-toggle="modal" data-target="#myModal"/></div> <div class="photo-caption">Liquid water sustains life on earth, but its physical properties remain mysterious among scientific researchers. Recently, a team of Swiss researchers used existing THz spectroscopy techniques to measure liquid water's hydrogen bonding. Future efforts with this technique could one day help explain water's peculiar properties. The team reports their findings in The Journal of Chemical Physics. This image shows a Dipolar Lennard-Jones sphere solvated in water.</div> <div class="photo-credit"><em>Credit: Hamm</em></div> <div class="clearfix"></div>  <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content modal-content-custom"> <div class="modal-image"><img class="img-responsive center-block" src="/web/20180628213637im_/https://www.sciencedaily.com/images/2018/06/180627160224_1_900x600.jpg" width="385" height="366"/></div> <div class="modal-text"> <div class="modal-caption">Liquid water sustains life on earth, but its physical properties remain mysterious among scientific researchers. Recently, a team of Swiss researchers used existing THz spectroscopy techniques to measure liquid water's hydrogen bonding. Future efforts with this technique could one day help explain water's peculiar properties. The team reports their findings in The Journal of Chemical Physics. This image shows a Dipolar Lennard-Jones sphere solvated in water.</div> <div class="modal-credit"><em>Credit: Hamm</em></div> <div class="modal-close"><button type="button" class="btn btn-default" data-dismiss="modal">Close</button></div> <div class="clearfix"></div> </div> </div> </div> </div> </div>  <div class="clearfix"></div> <div id="story_text" class="hyphenate"> <p id="first" class="lead">Liquid water sustains life on earth, but its physical properties remain mysterious among scientific researchers. Recently, a team of Swiss researchers used existing THz spectroscopy techniques to measure liquid water's hydrogen bonding. Future efforts with this technique could one day help explain water's peculiar properties. The team reports their findings in <em>The Journal of Chemical Physics</em>, from AIP Publishing.</p> <div class="mobile-top-rectangle hidden-md hidden-lg"> <div class="textrule"> <span>advertisement</span> </div>  <div id="adslot-mobile-top-rectangle"> <script type="text/javascript"> googletag.cmd.push(function() { deployads.push(function() { deployads.gpt.display("adslot-mobile-top-rectangle") }); }); </script> </div> <hr class="hrrule"/> </div> <div id="text"> <p>"What makes this paper special is the aspect of THz spectroscopy of a liquid. In the THz range, we make spectroscopy explicitly of the intermolecular degrees of freedom of the system in the study, to contrast it to intramolecular degrees of freedom," said Peter Hamm, an author on the paper. "With THz spectroscopy, we can very directly look at the hydrogen bonding between various water molecules."</p> <p>Researchers use spectroscopy to measure the interaction of matter with light and infer something's physical composition. In this experiment, the researchers excited a dye molecule dissolved in water with an ultrashort visible laser pulse, changing its charge distribution. Then, a THz pulse measured the response of the surrounding water molecules as a function of the time after that excitation process.</p> <p>THz spectroscopy, which is relatively low frequency, enables researchers to examine the forces that exist between water molecules. Observing these intermolecular forces could help researchers understand water's anomalies, because hydrogen bonding in liquid water molecules make up many of water's unexpected properties, like its unusual density maximum at 4 degrees Celsius.</p> <p>"The response we found in the THz frequency range was surprisingly slow. Water is typically considered to be a very fast solvent with a response in the subpicosecond range, but we found a timescale around 10 picoseconds in the THz," Hamm said. They attributed the slow timescale to the collective nature of the water response that was probed using THz spectroscopy.</p> <p>Hamm clarified that researchers have been using THz spectroscopy for more than 20 years and cautioned optimism about the results. "The outcome often has been a bit disappointing because the THz spectra of liquids like water are extremely broad and blurred, and it's very hard to extract information out of that," he said. Time-resolved techniques, like in this study, might overcome that limitation.</p> <p>Next, the researchers plan to use their method to look at water's structure and dynamics when it's still liquid, but below the freezing point. Hamm explained, "The special properties of water become significantly more pronounced if one goes to temperatures below the freezing point."</p> </div> <div class="mobile-middle-rectangle hidden-md hidden-lg"> <div class="textrule"> <span>advertisement</span> </div>  <div id="adslot-mobile-middle-rectangle"> <script type="text/javascript"> googletag.cmd.push(function() { deployads.push(function() { deployads.gpt.display("adslot-mobile-middle-rectangle") }); }); </script> </div> <hr class="hrrule"/> </div> <hr class="hidden-sm hidden-xs"/> <div id="story_source"> <p><strong>Story Source:</strong></p> <p>Materials provided by <a href="https://web.archive.org/web/20180628213637/http://www.aip.org/" rel="nofollow" target="_blank"><strong>American Institute of Physics</strong></a>. <em>Note: Content may be edited for style and length.</em></p> </div>  <hr/> <div id="journal_references"><p><strong>Journal Reference</strong>:</p> <ol class="journal"> <li>Saima Ahmed, Andrea Pasti, Ricardo J. Fernández-Terán, Gustavo Ciardi, Andrey Shalit, Peter Hamm. <strong>Aqueous solvation from the water perspective</strong>. <em>The Journal of Chemical Physics</em>, 2018; 148 (23): 234505 DOI: <a href="https://web.archive.org/web/20180628213637/http://dx.doi.org/10.1063/1.5034225" rel="nofollow" target="_blank">10.1063/1.5034225</a> </li> </ol> <hr/> </div>  <div id="citations"> <div role="tabpanel" class="right-tabs clearfix"> <p class="pull-left"><strong>Cite This Page</strong>:</p>  <ul class="nav nav-tabs" role="tablist"> <li role="presentation" class="active"><a href="#citation_mla" aria-controls="citation_mla" role="tab" data-toggle="tab">MLA</a></li> <li role="presentation"><a href="#citation_apa" aria-controls="citation_apa" role="tab" data-toggle="tab">APA</a></li> <li role="presentation"><a href="#citation_chicago" aria-controls="citation_chicago" role="tab" data-toggle="tab">Chicago</a></li> </ul> <div class="tab-content tab-citations"> <div role="tabpanel" class="tab-pane active" id="citation_mla">American Institute of Physics. 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THz spectroscopy could help explain water's anomalies -- ScienceDaily