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报告主题：Time resolved fluorescence stokes shift to probe water and protein dynamics (时间分辨荧光斯托克斯位移探测水和蛋白质的动力学)
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报 告 人: Tanping Li（Louisiana State University, USA)
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| 时 间：2016年4月7日（周四)13:00 |
| 地 点：校本部E106，上海大学量子与分子结构国际中心（ICQMS） |
| 主办部门：理学院物理系 |
| 邀 请 人：任伟 教授、Jeffrey Reimers教授 |
报告摘要:
Time resolved fluorescence Stokes shift is applied to probe solvation dynamics. We report the theoretical studies on water and protein dynamics following photoexcitation of tryptophan. The results show that the initial dynamics in a few picoseconds represents fast local motions such as reorientations and translations of hydrating water molecules, followed by slow relaxation involving strongly coupled water−protein motions.
Linear response theory correlates the relaxation dynamics of fluorescence to the equilibrium fluctuations of the solute-solvent interactions, wherein the solvation time correlation function is calculated on the ground state of the solute in the majority of studies. Our results conclude that the equilibrium statistics on the excited state surface characterize the relaxation dynamics of the fluorescence Stokes shift.
