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<p class="MsoTitle" style="margin-right:-.5in"><font class="Apple-style-span" face="'Times New Roman'" size="4"><b><br>
</b></font></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Seminar on</span></b></font></p>
<p class="MsoNormal" align="center" style="text-align:center"><font class="Apple-style-span" size="4"><b style="mso-bidi-font-weight:
normal"><span style="letter-spacing: 1.5pt; ">Modern Optics and Spectroscopy</span></b></font><b style="mso-bidi-font-weight:
normal"><span style="font-family: Arial; letter-spacing: 1pt; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b style="mso-bidi-font-weight:
normal"><font class="Apple-style-span" size="4">Ultrafast Dynamics in Photosynthetic Complexes and Components of DNA<o:p></o:p></font></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">Andrew Moran</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">University of North Carolina at Chapel Hill</font></span><span class="Apple-style-span" style="letter-spacing: 1px; font-size: large; "> </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></p>
<p class="MsoNormal" align="center" style="text-align:center;tab-stops:right 6.5in">
<font class="Apple-style-span" size="4"><o:p>Tuesday March 6, 2012<font class="Apple-style-span" face="Times"> </font></o:p></font></p>
<p class="MsoNormal" style="text-align:justify"><font class="Apple-style-span" size="4">Transport processes and spectroscopic phenomena in light harvesting proteins are intimately connected to the delocalization of electronic states.<!--[if supportFields]><span
style='mso-element:field-begin'></span> ADDIN EN.CITE
<EndNote><Cite><Author>Davydov</Author><Year>1971</Year><RecNum>46</RecNum><record><rec-number>46</rec-number><ref-type
name="Book">6</ref-type><contributors><authors><author>Davydov,
A.</author></authors></contributors><titles><title>Theory
of Molecular
Excitons</title></titles><dates><year>1971</year><pub-dates><date>1971</date></pub-dates></dates><pub-location>New
York</pub-location><publisher>Plenum</publisher><label>davydov71</label><urls></urls></record></Cite><Cite><Author>Capek</Author><Year>1994</Year><RecNum>410</RecNum><record><rec-number>410</rec-number><ref-type
name="Book">6</ref-type><contributors><authors><author>Capek,
V.</author><author>Silinish,
E.</author></authors></contributors><titles><title>Organic
Molecular Crystals: Interaction, Localization, and Transport
Phenomena</title></titles><dates><year>1994</year></dates><pub-location>New
York</pub-location><publisher>AIP</publisher><urls></urls></record></Cite><Cite><Author>Abramavicius</Author><Year>2009</Year><RecNum>569</RecNum><record><rec-number>569</rec-number><ref-type
name="Journal
Article">17</ref-type><contributors><authors><author>Abramavicius,
D.</author><author>Palmieri,
B.</author><author>Voronine, D.
V.</author><author>Sanda, F.</author><author>Mukamel,
S.</author></authors></contributors><titles><title>Coherent
Multidimensional Optical Spectroscopy of Excitons in Molecular Aggregates;
Quasiparticle versus Supermolecule
Perspectives</title><secondary-title>Chem.
Rev.</secondary-title></titles><pages>2350-2408</pages><volume>109</volume><dates><year>2009</year></dates><urls></urls></record></Cite><Cite><Author>Spano</Author><Year>2010</Year><RecNum>662</RecNum><record><rec-number>662</rec-number><ref-type
name="Journal
Article">17</ref-type><contributors><authors><author>Spano,
F. C.</author></authors></contributors><titles><title>The
Spectral Signatures of Frenkel Polarons in H- and
J-Aggregates</title><secondary-title>Acc. Chem.
Res.</secondary-title></titles><periodical><full-title>Acc.
Chem.
Res.</full-title></periodical><pages>10.1021/ar900233v</pages><volume>ASAP</volume><dates><year>2010</year></dates><urls></urls></record></Cite></EndNote><![endif]--><!--[if supportFields]><span
style='mso-element:field-end'></span><![endif]--><span style="mso-spacerun:yes">
</span>Decoherence imposed by low-frequency nuclear motion generally suppresses the delocalization of electronic states, whereas the Franck-Condon progressions of high-frequency intramolecular modes underpin a hierarchy of vibronic electrostatic interactions
between pigments.<span style="mso-spacerun:yes"> </span>We use femtosecond laser spectroscopies to investigate the impact of vibronic couplings on the electronic structures and relaxation mechanisms of two cyanobacterial light harvesting proteins, allophycocyanin
(APC) and c-phycocyanin (CPC).<span style="mso-spacerun:yes"> </span>Both APC and CPC possess three pairs of pigments (i.e., dimers), which undergo electronic relaxation on the sub-picosecond time scale.<span style="mso-spacerun:yes">
</span>Electronic relaxation is approximately 10 times faster in APC than in CPC despite the nearly identical structures of their pigment dimers.<span style="mso-spacerun:yes">
</span>We find that electronic relaxation in these closely related proteins is understood on the same footing only in a basis of joint electronic-nuclear states (i.e., vibronic excitons).<span style="mso-spacerun:yes">
</span><o:p></o:p></font></p>
<p class="MsoNormal" style="text-align:justify"><font class="Apple-style-span" size="4">Intriguing fundamental physics surround photoinduced relaxation processes in DNA.<span style="mso-spacerun:yes">
</span>Internal conversion rapidly (<500fs) deactivates excited electronic states in the DNA bases, thereby suppressing the formation of lesions known to inhibit cellular function (e.g., thymine dimers).<span style="mso-spacerun:yes">
</span>We investigated these photoinduced relaxation processes in thymine and adenine families of systems at 100K and 300K using nonlinear laser spectroscopies.
<span style="mso-spacerun:yes"> </span>Our data indicate that 14meV energy barriers reside between the Franck-Condon regions of the ππ* surfaces and the conical intersections leading back to the ground electronic states in both families of systems.<span style="mso-spacerun:yes">
</span>It follows that the internal conversion transitions responsible for DNA photoprotection are readily initiated by thermal fluctuations at equilibrium. This study is made possible by our extension of specialized femtosecond laser techniques to the UV spectral
range.<span style="mso-spacerun:yes"> </span><o:p></o:p></font></p>
<p class="MsoNormal" style="text-align:justify"><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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