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<!--StartFragment--><p class="MsoTitle" style="text-align: center;margin-right: -0.5in; "><b><span style="font-family:"Times New Roman""><font size="4">Seminar on</font></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><font size="4"><b><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b><span style="font-family:Arial;
letter-spacing:1.5pt"><o:p></o:p></span></font></p><p class="MsoNormal"><b><span style="font-family: Arial; letter-spacing: 1pt; "><font size="4"> </font></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; "><font size="4">Exploring the high-resolution
spectroscopy of molecules that can affect the quality <o:p></o:p></font></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; "><font size="4">of your life<o:p></o:p></font></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; "><font size="4"> </font></span></i></b></p><p class="MsoNormal" align="center" style="text-align:center"><b><span style="letter-spacing: 1pt; "><font size="4">Terry Miller,<o:p></o:p></font></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font size="4">Ohio
State University<o:p></o:p></font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font size="4"> </font></span><span style="font-size: large; letter-spacing: 1pt; ">Tuesday,
December 10, 2013</span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1px; "><font size="4">12:00pm-1:00pm</font></span></p><p class="MsoNormal" style="text-align:justify"><font size="4">Few things affect your quality of
life more than the air you breathe and the temperature of your immediate
environment. Since more than 80% of the energy used in the industrialized world
today is still derived from fossil fuels, these two quantities are not
unrelated. Annually more than 100 Tg of organic molecules are injected into the
troposphere and are mostly degraded via oxidative processes involving free
radical intermediates. Many of those intermediates are the same as the ones
involved in the combustion of fossil fuels. Two of the key oxidizing
intermediates are hydroxyl, OH (day), and nitrate, NO<sub>3</sub> (night),
radicals and early oxidation intermediates of organic compounds include the
alkoxy (RO) and peroxy (RO<sub>2</sub>) families of radicals. The spectroscopy of
OH is well known, but there is still a lot to be learned about the spectroscopy
of RO, RO<sub>2</sub>, and NO<sub>3</sub> radicals both for diagnostic purposes
and in terms of characterizing their molecular properties and benchmarking
quantum chemistry calculations. Both peroxy radicals and NO<sub>3</sub> have
weak Ã-X̃ electronic transitions in the near infrared (NIR). We have utilized
moderate resolution cavity ringdown spectroscopy (CRDS) to study ambient
temperature radicals and high resolution (HR-CRDS) to study these jet-cooled
radicals. Comparable laser induced fluorescence (LIF) measurements have been
made for the alkoxy species. This talk
will focus on the similarities (and differences) of the electronic structure of
the RO, RO<sub>2</sub>, and NO<sub>3</sub> radicals and the spectra observed at
room temperature and under free-jet conditions. The capability of the spectra
to provide unambiguous diagnostics for monitoring the concentrations and
reactions of these radicals will be discussed. Both vibrational and rotational
resolution of the electronic spectra is possible. Data obtained from the
spectral observations provide information about both the geometric and
electronic structure of these radicals as well as their dynamics.</font></p><p class="MsoNormal" align="center" style="text-align:center"><font size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center" style="text-align:center"><font size="4">Refreshments served after
the lecture</font><font size="6"><o:p></o:p></font></p>
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