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<p class="MsoNormal"><span style="font-size:15.0pt;color:black">There will be a Modern Optics and Spectroscopy Seminar held<span class="apple-converted-space"><b> </b></span></span><b><span style="font-size:15.0pt">today<span style="color:black">
</span></span></b><span style="font-size:15.0pt;color:black">in<span class="apple-converted-space"> </span><b><a href="http://whereis.mit.edu/?go=34"><span style="color:#954F72">34-401A</span></a><span class="apple-converted-space"> </span>at 12pm</b></span><o:p></o:p></p>
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<b><span style="font-size:14.0pt;color:red"> </span></b><b><span style="font-size:14.0pt;color:black"> </span></b><o:p></o:p></p>
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<b><span style="font-size:20.0pt;color:black">Kang-Kuen Ni</span></b><o:p></o:p></p>
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<span class="3"><b><span style="font-size:16.0pt;color:black">Harvard University</span></b></span><i><span style="font-size:14.0pt;font-family:"Adobe 명조 Std M";color:black"><br>
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</span></i><b><span style="font-size:18.0pt;font-family:"Arial",sans-serif;color:black">“Ultracold Chemical reactions with molecules in slow motion<span class="1">”</span></span></b><o:p></o:p></p>
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<span style="font-size:18.0pt;font-family:"Adobe 명조 Std M";color:red"><br>
</span><i><span style="font-size:12.0pt;color:black">Recent tools developed for cooling atoms and molecules allow certain classes of molecules to be prepared in the micro-Kelvin temperature range. This allowed the first exploration of chemistry in the ultracold
regime. Bi-alkali molecules (e.g. KRb, NaRb, RbCs, NaK...) are especially suitable for such studies, and bi-alkali collisions and reactions were probed extensively by measuring the loss rate of reactants that were prepared in certain quantum states. In these
experiments, atom loss rate serves as a proxy for the chemical reaction rate. After 10 years of work using loss rates to reveal rich information about the long-range physics that determines how the reactants approach each other, including the role of quantum
statistics, we recently gained the capability of direct detection of products. In particular, we combined ionization detection and ion velocity map imaging within a potassium-rubidium (KRb) quantum gas apparatus. These new tools allowed us to directly detect
all relevant species in the intriguing 4-center reaction KRb + KRb -> K2Rb2* -> K2+Rb2, including the surprising detection of the intermediate complex. We found the intermediate complex to be long-lived (of order one microsecond) which we further took advantage
of to control the product formation rate by an external light source. The new capability of detecting reaction products rather than merely reactant loss opens new opportunities for reaction studies.</span></i><o:p></o:p></p>
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<span style="font-size:14.0pt;color:black">Refreshments will be served immediately following the seminar!</span><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"><i><span style="font-family:"Times New Roman",serif;color:black">Michelle Contos</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Administrative Assistant</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Massachusetts Institute of Technology</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Department of Chemistry</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">77 Massachusetts Ave, 6-333</span></i><o:p></o:p></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Cambridge, MA 02139</span></i><o:p></o:p></p>
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