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<p class="MsoNormal"><span style="font-size:11.0pt">Please join us for a Modern Optics and Spectroscopy seminar tomorrow, Tuesday, March 28 at 12pm in 34-401, presented by Professor Melanie Schnell (Max-Planck-Institut, Hamburg). Lunch will be served immediately
following the lecture:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><i>"Deciphering the structure, dynamics and chirality of complex molecules"<o:p></o:p></i></b></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b>Professor Melanie Schnell<o:p></o:p></b></p>
<p class="MsoNormal"><b>Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany<o:p></o:p></b></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><i>Most molecules of biochemical relevance are chiral. Even though the physical properties of two enantiomers are nearly identical, they can exhibit completely different biochemical effects, such as different odor in the case of carvone.
In nature and as products of chemical syntheses, chiral molecules often exist in mixtures with other chiral species. The analysis of these complex mixtures to identify the molecular components, to determine which enantiomers are present, and to measure the
enantiomeric excesses (ee) remains a challenging task for analytical chemistry.<o:p></o:p></i></p>
<p class="MsoNormal"><i> <o:p></o:p></i></p>
<p class="MsoNormal"><i>In collaboration with Dave Patterson and John Doyle from Harvard University, we recently experimentally demonstrated a new method of differentiating enantiomeric pairs of chiral molecules in the gas phase. It is based on broadband rotational
spectroscopy and is a three-wave mixing process that involves a closed cycle of three rotational transitions. The phase of the acquired signal bares the signature of the enantiomer, as it depends upon the product of the transition dipole moments, and the signal
amplitude is proportional to the ee. A unique advantage of our technique is that it can also be applied to mixtures of chiral molecules, even when the molecules are very similar. It also bears the potential for enantiomer separation. In my lecture, I will
introduce the technique and give an update on the recent developments.<o:p></o:p></i></p>
<p class="MsoNormal"><i> <o:p></o:p></i></p>
<p class="MsoNormal"><i>In a second part of the talk, if time allows, I will discuss recent developments in broadband rotational spectroscopy for astrochemistry studies.<o:p></o:p></i></p>
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<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:Tahoma;color:black">Christine Brooks</span></b><span style="font-size:10.5pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Administrative Assistant<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Massachusetts Institute of Technology<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Department of Chemistry<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">77 Massachusetts Ave, 6-333<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Cambridge, MA 02139<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">p: 617.253.7239<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">e: cbrooks@mit.edu<o:p></o:p></span></p>
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