顺，顺-1,3-环辛二烯的激发态动力学：紫外泵浦真空紫外探测时间分辨光电子能谱

Excited state dynamics of cis,cis-1,3-cyclooctadiene: UV pump VUV probe time-resolved photoelectron spectroscopy.

作者信息

Liu Yusong, Chakraborty Pratip, Matsika Spiridoula, Weinacht Thomas

机构信息

Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.

Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.

出版信息

J Chem Phys. 2020 Aug 21;153(7):074301. doi: 10.1063/5.0006920.

DOI:10.1063/5.0006920

PMID:32828099

Abstract

We present UV pump, vacuum ultraviolet probe time-resolved photoelectron spectroscopy measurements of the excited state dynamics of cis,cis-1,3-cyclooctadiene. A 4.75 eV deep UV pump pulse launches a vibrational wave packet on the first electronically excited state, and the ensuing dynamics are probed via ionization using a 7.92 eV probe pulse. The experimental results indicate that the wave packet undergoes rapid internal conversion to the ground state in under 100 fs. Comparing the measurements with electronic structure and trajectory surface hopping calculations, we are able to interpret the features in the measured photoelectron spectra in terms of ionization to several states of the molecular cation.

摘要

我们展示了对顺，顺 - 1,3 - 环辛二烯激发态动力学的紫外泵浦、真空紫外探测时间分辨光电子能谱测量。一个4.75 eV的深紫外泵浦脉冲在第一电子激发态上启动一个振动波包，并通过使用7.92 eV的探测脉冲进行电离来探测随后的动力学过程。实验结果表明，该波包在100 fs内迅速发生内转换回到基态。将测量结果与电子结构和轨迹表面跳跃计算进行比较，我们能够根据分子阳离子的几种状态的电离来解释所测量的光电子能谱中的特征。