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<!--StartFragment--><p class="MsoTitle" style="text-align: center;margin-right: -0.5in; "><b style="mso-bidi-font-weight:
normal"><span style="font-family:"Times New Roman""><font class="Apple-style-span" size="4">Seminar on</font></span></b></p><p class="MsoTitle" style="text-align: center;margin-right: -0.5in; "><span class="Apple-style-span" style="font-size: large; "><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b></span></p><p class="MsoNormal" align="center" style="margin-right:-13.5pt;text-align:center"><b style="mso-bidi-font-weight:normal"><i style="mso-bidi-font-style:normal"><font class="Apple-style-span" size="4">Adventures with
chirped-pulse<o:p></o:p></font></i></b></p><p class="MsoNormal" align="center" style="margin-right:-13.5pt;text-align:center"><b style="mso-bidi-font-weight:normal"><i style="mso-bidi-font-style:normal"><font class="Apple-style-span" size="4">millimeter-wave
spectroscopy<o:p></o:p></font></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal">Kirill
Prozument</b><span style="letter-spacing: 1pt; ">,<o:p></o:p></span></font></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Massachusetts
Institute of Technology</font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span><span class="Apple-style-span" style="letter-spacing: 1px; font-size: large; ">Tuesday,
October 16, 2012</span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">12:00 –
1:00 p.m.</font></span><span class="Apple-style-span" style="font-size: large; "> </span></p>
<font class="Apple-style-span" size="4"><div style="text-align: center;"><br></div></font><p class="MsoNormal" style="text-align: center;text-indent: 0.5in; "><font class="Apple-style-span" size="4">Recent
development of the chirped-pulse Fourier transform microwave (CP-FTMW)
spectroscopy by Brooks Pate and coworkers has revolutionized the field of
microwave spectroscopy. Large spectral regions (<i style="mso-bidi-font-style:
normal">~</i>10 GHz) are covered instantly with high resolution (<i style="mso-bidi-font-style:normal">~</i>100 kHz) and meaningful relative
intensities of the transitions. Chirped-pulse millimeter-wave (CPmmW)
spectroscopy developed recently in the Field group at MIT is an extension of
the CP-FTMW technique to the millimeter-wave (mm-wave) region of 70–100 GHz. </font></p><p class="MsoNormal" style="text-align: center;"><font class="Apple-style-span" size="4"><span style="mso-tab-count:1"> </span>The
technique opens new possibilities in spectroscopic studies ranging from
light–matter interaction to chemistry of aldehydes and ketones. The following
topics will be covered in this talk:</font></p><p class="MsoNormal" style="text-align: center;"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal">CPmmW spectroscopy of Rydberg-Rydberg transitions is Ca atoms.</b> Atoms
and molecules in Rydberg states have unusually high polarizability and the
transition dipole moments on the order of 10<sup>3</sup> Debye. The populations
and coherencies of Rydberg states are easily manipulated with CPmmW. Direct
detection of coherent mm-wave radiation from such transitions is detected with
CPmmW, and reveals the collective effects of interaction between the Rydberg
atoms and the mm-wave field.</font></p><p class="MsoNormal" style="text-align: center;"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal">Chemistry mediated by free H atoms is studied by CPmmW spectroscopy.</b>
Unimolecular decomposition reactions, initiated by photolysis or pyrolysis,
reveal the basic chemical mechanisms, and have been at the core of physical
chemistry research. Bimolecular reactions involving free H atoms seem to be
playing a key role in thermal decomposition of aldehydes and ketones, and have
been studied with CPmmW spectroscopy. Extension of this experimental approach
to more complex systems that are relevant to biomass decomposition will be
discussed.</font></p><p class="MsoNormal" align="center" style="text-align:center"><o:p><font class="Apple-style-span" size="4"> </font></o:p></p><p class="MsoNormal" align="center" style="text-align:center"><o:p><font class="Apple-style-span" size="4"> </font></o:p></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4">Refreshments served after
the lecture</font><font class="Apple-style-span" size="6"><o:p></o:p></font></p>
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