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<p class="MsoNormal"><span style="font-size:14.0pt">There will be a Modern Optics and Spectroscopy Seminar held
<b>today at 12pm </b>in <b><span style="color:red">56-154</span></b></span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:red">**Please note location**</span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt"> </span></b><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">Amy S. Mullin</span></b><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:14.0pt">Professor of Chemistry and Biochemistry, University of Maryland, College Park
<br>
<br>
</span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:16.0pt">“<b><i><span style="color:black">Dynamics of molecules in extreme rotational states made with an optical centrifuge”</span></i></b></span><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;color:black"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:11.0pt;color:black">Our research investigates the behavior of molecules in extreme rotational states made with an optical centrifuge. The optical centrifuge is based on combining oppositely chirped pulses of light
in order to trap and spin molecules to high angular frequencies. The trapped molecules end up with angular frequencies of 45 THz and angular momentum vectors that are oriented in the lab frame. In the case of CO<sub>2</sub> and N<sub>2</sub>O, the centrifuged
molecules have energies greater than 20,000 cm<sup>-1</sup> and rotational quantum numbers greater than J=200. This energy regime is unexplored territory in the world of molecular physics. The relaxation dynamics of the molecules is interrogated with polarization-dependent
high-resolution transient IR spectroscopy. Results will be presented on orientational anisotropy decay, buffer gas collisions and new spectroscopy of high J molecules. </span></i><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Refreshments will be served immediately following the seminar<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Christine Brooks</span></b><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Administrative Assistant</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Massachusetts Institute of Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Department of Chemistry</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">77 Massachusetts Ave, 6-333</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Cambridge, MA 02139</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">p: 617.253.7239</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt">e: <a href="mailto:cbrooks@mit.edu">cbrooks@mit.edu</a></span><o:p></o:p></p>
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