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<!--StartFragment--><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; "><br>Modern Optics and Spectroscopy</span></b></font></p><div><br></div><p class="MsoNormal" style="mso-pagination:none;mso-layout-grid-align:none;
text-autospace:none"><b style="mso-bidi-font-weight:normal"><i style="mso-bidi-font-style:normal"><font class="Apple-style-span" size="4"><span class="Apple-tab-span" style="white-space:pre"> </span>Orientational Dynamics of water probed with ultrafast 2D IR spectral
anisotropy<o:p></o:p></font></i></b></p><p class="MsoNormal" style="mso-pagination:none;mso-layout-grid-align:none;
text-autospace:none"></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">Krupa
Ramasesha</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<o:p></o:p></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></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; "><font class="Apple-style-span" size="4">Tuesday,
October 18, 2011<o:p></o:p></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></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.<o:p></o:p></font></span></p><p class="MsoNormal" align="center" style="text-align:center"><span class="Apple-style-span" style="font-size: large; "><span style="font-family: 'Times New Roman'; ">The
rapidly evolving structure of liquid water’s hydrogen bond network is at the
heart of numerous aqueous physical phenomena such as ion solvation and
mobility, the hydrophobic effect, proton transport, chemical reactivity and
biological processes. Ultrafast 2D IR spectroscopy has proven to be a useful
tool in probing local fluctuations and structural reorganization of water on
femtosecond to picosecond timescales. Rearrangements of the hydrogen bond
network of liquid water are believed to involve rapid and concerted hydrogen bond
switching events, during which a hydrogen bond donor molecule undergoes large
angle molecular reorientation as it exchanges hydrogen bonding partners. We have
performed measurements of ultrafast 2D IR spectral anisotropy on the OH
stretching vibration of HOD in D<sub>2</sub>O to directly track the
reorientation of water molecules as they change hydrogen bonding environments.</span><span style="font-family: 'Times New Roman'; "><sup><span style="mso-no-proof:yes">6</span></sup></span><span style="font-family: 'Times New Roman'; "> My talk will summarize the results and conclusions from
these experiments.</span></span></p><p class="MsoNoSpacing"><span style="font-family: 'Times New Roman'; "><o:p><font class="Apple-style-span" size="4"> </font></o:p></span></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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