Liu Yusong, Rozgonyi Tamás, Marquetand Philipp, Weinacht Thomas
Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA.
Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary.
J Chem Phys. 2020 Nov 14;153(18):184304. doi: 10.1063/5.0026177.
We perform time-resolved ionization spectroscopy measurements of the excited state dynamics of CHI and CHIBr following photoexcitation in the deep UV. The fragment ions produced by ionization with a vacuum-ultraviolet probe pulse are measured with velocity map imaging, and the momentum resolved yields are compared with trajectory surface hopping calculations of the measurement observable. Together with recent time-resolved photoelectron spectroscopy measurements of the same dynamics, these results provide a detailed picture of the coupled electronic and nuclear dynamics involved. Our measurements highlight the non-adiabatic coupling between electronic states, which leads to notable differences in the dissociation dynamics for the two molecules.
我们对深紫外光激发后的CHI和CHBr的激发态动力学进行了时间分辨电离光谱测量。用真空紫外探测脉冲电离产生的碎片离子通过速度成像进行测量，并将动量分辨产率与测量可观测量的轨迹表面跳跃计算结果进行比较。结合最近对相同动力学的时间分辨光电子能谱测量，这些结果提供了所涉及的耦合电子和核动力学的详细图景。我们的测量突出了电子态之间的非绝热耦合，这导致了两种分子解离动力学的显著差异。
