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<p class="MsoNormal"><span style="font-size:13.0pt">Please join us for a special Modern Optics and Spectroscopy seminar
<b>today at 12pm</b> in MIT Room <b>6-120</b>:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:13.0pt"> </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:16.0pt">Professor Daniel Neumark</span></b><span style="font-size:16.0pt"><br>
University of California, Berkeley</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:16.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:16.0pt">Slow Electron Velocity Map Imaging of Cryogenically Cooled Anions</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"><i><span style="font-size:14.0pt">Slow-electron velocity-map imaging of cryogenically cooled anions (cryo-SEVI) is a high resolution variant of anion photoelectron spectroscopy that yields spectra of complex species with resolution as high
as 1-2 cm<sup>-1</sup>. This resolution is achieved by trapping anions in an octopole trap in which buffer-gas cooling brings their temperature down to approximately 10 K. The anions are then extracted from the trap, mass-selected, and photodetached. The resulting
photoelectrons are analyzed with velocity-map imaging electron optics set up to selectively collect slow electrons. This technique reveals extensive vibrational structure associated with the neutral species generated by photodetachment. Results will be presented
for free radicals, bare and complexed metal oxide clusters, and transition state species associated with unimolecular and bimolecular reactions.</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-size:14.0pt"> </span></i><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:13.0pt">Refreshments will be served in the lobby of Building 6 immediately following the seminar</span><o:p></o:p></p>
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<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>
<p class="MsoNormal"> <o:p></o:p></p>
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