Excited-state dynamics of CH2I2 and CH2IBr studied with UV-pump VUV-probe momentum-resolved photoion spectroscopy

Author(s)
Yusong Liu, Tamas Rozgonyi, Philipp Marquetand, Thomas Weinacht
Abstract

We perform time-resolved ionization spectroscopy measurements of the excited state dynamics of CH2I2 and CH2IBr 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.

Organisation(s)
Department of Theoretical Chemistry, Research Platform Accelerating Photoreaction Discovery, Research Network Data Science
External organisation(s)
State University of New York, Stony Brook, Hungarian Academy of Sciences
Journal
Journal of Chemical Physics
Volume
153
No. of pages
11
ISSN
0021-9606
DOI
https://doi.org/10.1063/5.0026177
Publication date
11-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
104017 Physical chemistry, 103006 Chemical physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/excitedstate-dynamics-of-ch2i2-and-ch2ibr-studied-with-uvpump-vuvprobe-momentumresolved-photoion-spectroscopy(ade44ea2-14ee-4804-b213-97b2cfaebf74).html