一、题目：Visualization of dissipative wavepacket dynamics at conical intersections

二、主讲人：陈立朋

三、时间：2018年9月28日（星期五）下午15:30

四、地点：闻理园A4-218

内容摘要：The effect of a dissipative thermal environment on the ultrafast nonadiabatic dynamics at conical intersections is

nowadays well understood. Yet, the molecular wavepacket dynamics at conical intersections has not been directly characterized

and monitored via femtosecond nonlinear spectroscopy. Transient absorption pump-probe spectroscopy with white-light

continuum detection has recently reached a 5-10 fs time resolution, which enables a direct characterization of molecular

wavepackets possessing multiple vibrational modes. We have combined the hierarchy equation of motion with the

equation-of-motion phase-matching approach to simulate pump-probe and fluorescence up-conversion signals for a

model of S2(ππ*)-S1 (nπ*) conical intersection in pyrazine which is bilinearly coupled to a harmonic bath with Drude

spectral density function. Our results show that the signals indeed visualize evolutions of the wave packet at conical

intersections, and these evolutions are quite sensitive to the bath parameters as well as to the envelope of the laser pulses.

主讲人简介: 陈立朋, 新加坡南洋理工大学材料科学系博士、德国慕尼黑工业大学洪堡学者。主要从事超快激子、

电子传输动力学的研究。已经在J. Chem. Phys.、Phys. Chem. Chem. Phys.、J. Phys. Chem. Lett.、Phys. Rev. B

等期刊上发表SCI论文20余篇。

参考文献：

[1]Dissipative dynamics at conical intersections: simulations with the hierarchy equations of motion method. Lipeng Chen,

Maxim F. Gelin, Vladimir Y. Chernyak, Wolfgang Domcke and Yang Zhao. Faraday Discuss, 194, 61 (2016).

[2]Multimode quantum dynamics with a multiple Davydov D2 trial states: Application to a 24-dimensional conical intersection

model. Lipeng Chen, Maxim Gelin, and Wolfgang Domcke. Submitted to JCP

[3]Time and frequency-resolved fluorescence spectra of conical intersections: What photons can tell us. Lipeng Chen, Maxim

Gelin, and Wolfgang Domcke. (In preparation)