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)
