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Ultrafast photochemical processes in 1,2-dichloroethene measured with a universal XUV probe

McGhee, HG; Thompson, HJ; Thompson, J; Yu Zhang; Wyatt, AS; Springate, E; Chapman, RT; ... Parkes, MA; + view all (2024) Ultrafast photochemical processes in 1,2-dichloroethene measured with a universal XUV probe. Physical Chemistry Chemical Physics , 26 (45) pp. 28406-28416. 10.1039/d4cp02952f. Green open access

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Abstract

The presence of two chlorine atoms in 1,2-dichloroethene allows for isomerization around the double bond. This isomerization can lead to rich photochemistry. We present a time-resolved pump–probe photoelectron spectroscopy measurement on both the cis- and trans- isomers of 1,2-dichloroethene. A universal XUV probe of 22.3 eV is used allowing observation of photoelectrons formed anywhere on the potential energy surface, even from the ground-state or dissociation products. Following excitation with a 200 nm pump both ultrafast excited state dynamics and product formation are observed within the time resolution of the experiment. Excited state population begins to return to the ground state on an ultrafast time scale (o70 fs) and population of products channels is observed on the same timescale. With the aid of ab initio calculations it is found that population transfer from the excited state is facilitated by vibrational modes involving C–C–H bends.

Type: Article
Title: Ultrafast photochemical processes in 1,2-dichloroethene measured with a universal XUV probe
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/d4cp02952f
Publisher version: http://dx.doi.org/10.1039/d4cp02952f
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10200865
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