Thanks for your response. What I was referring to was the absorption of near infrared light by DMSO, such when laser or LED light at that wavelength passes through pure DMSO. Do you have any info on DMSO's absorbance at that frequency? It would be of great help!<br>
<br><br><br><div class="gmail_quote">On Tue, Mar 20, 2012 at 11:20 PM, David van der Spoel <span dir="ltr"><<a href="mailto:spoel@xray.bmc.uu.se">spoel@xray.bmc.uu.se</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="HOEnZb"><div class="h5">On 2012-03-21 03:06, Nancy wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi All,<br>
<br>
I would greatly appreciate it if anyone could provide a reference or<br>
information on the electromagnetic absorbance characteristics of<br>
dimethyl sulfoxide, especially in the region of 800-1400nm.<br>
<br>
Thank you,<br>
Nancy<br>
<br>
<br>
<br>
<br>
<br>
</blockquote></div></div>
How is this measured, and what is the physical basis of this? Infrared spectroscopy usually does not go to such high energies, does it? 7000-12500/cm is a lot higher frequency than bond vibrations, and therefore the only likely effect that could take place at these frequencies are electronic effects. If you would like to compute this from a simulation the frequency dependent dielectric constant would be the most useful thing to try I would think, but to get reasonable numbers at high frequencies you need a polarizable model.<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
David van der Spoel, Ph.D., Professor of Biology<br>
Dept. of Cell & Molec. Biol., Uppsala University.<br>
Box 596, 75124 Uppsala, Sweden. Phone: <a href="tel:%2B46184714205" value="+46184714205" target="_blank">+46184714205</a>.<br>
<a href="mailto:spoel@xray.bmc.uu.se" target="_blank">spoel@xray.bmc.uu.se</a> <a href="http://folding.bmc.uu.se" target="_blank">http://folding.bmc.uu.se</a><br>
-- <br>
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</font></span></blockquote></div><br>