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<p class="MsoNormal"><span style="font-size:15.0pt;color:black">There will be a Modern Optics and Spectroscopy Seminar held<span class="apple-converted-space"><b> </b></span><b>Tuesday, December 3rd<span class="apple-converted-space"> </span></b>in<span class="apple-converted-space"> </span><b><a href="http://whereis.mit.edu/?go=34"><span style="color:#954F72">34-401A</span></a><span class="apple-converted-space"> </span>at
12pm</b></span><span style="color:black"><o:p></o:p></span></p>
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<b><span style="font-size:20.0pt;color:black">Minjung Son</span></b><span style="color:black"><o:p></o:p></span></p>
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<span class="3"><b><span style="font-size:16.0pt;color:black">MIT—Schlau-Cohen Group</span></b></span><i><span style="font-size:14.0pt;font-family:"Adobe 명조 Std M";color:black"><br>
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</span></i><b><span style="font-size:18.0pt;font-family:"Arial",sans-serif;color:black">“Mapping out pathways of light harvesting and photoprotection in plants with ultrabroadband two-dimensional electronic spectroscopy<span class="1">”</span></span></b><span style="color:black"><o:p></o:p></span></p>
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</span><span style="color:black">Plants harness energy by absorbing light across the visible region of the solar spectrum and then rapidly and efficiently funneling the energy towards the reaction center. Previous experiments to understand the mechanisms by
which energy relaxes across this large energy gap have been limited to the dynamics of the low-energy states, leaving the higher-lying states, including how they transfer energy downhill, unexplored. I will describe the development of an ultrabroadband two-dimensional
(2D) electronic spectrometer that enables us to map out the pathways of energy flow in light-harvesting complex II (LHCII), the major antenna complex of plants, across the visible region. The 2D spectra show that one of the carotenoids, lutein 2, plays a central
role in mediating light harvesting by accepting energy from higher-lying states and funneling it downhill via two parallel pathways, including a non-adiabatic transition into a dark state.
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<p class="a" style="margin:0in;margin-bottom:.0001pt;text-align:justify"><span style="color:black">In parallel with the light-harvesting pathways, plants have evolved pathways to protect against photooxidative damage, where harmful energy is rapidly dissipated
as heat. While the photophysical mechanism of dissipation has been widely debated, previous experiments lacked the spectral and temporal requirements to characterize the ultrafast timescales and large energy gaps involved. Using ultrabroadband 2D electronic
spectroscopy, I directly resolve a dissipative chlorophyll-to-carotenoid energy transfer pathway, which had been hypothesized yet previously unobserved. Furthermore, I will show that the amplitude of this dissipative pathway is sensitive to the local environment,
which may be used to control the subtle balance between light harvesting and photoprotection in vivo.<o:p></o:p></span></p>
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<span style="font-size:14.0pt;color:black">Refreshments will be served immediately following the seminar!</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Michelle Contos</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Administrative Assistant</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Massachusetts Institute of Technology</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Department of Chemistry</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">77 Massachusetts Ave, 6-333</span></i><span style="font-size:11.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-family:"Times New Roman",serif;color:black">Cambridge, MA 02139</span></i></p>
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