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

Autor:	McGhee HG; Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK. michael.parkes@ucl.ac.uk., Thompson HJ; School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK., Thompson J; Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK., Zhang Y; Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK., Wyatt AS; Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK., Springate E; Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK., Chapman RT; Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK., Horke DA; Radboud University, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands., Minns RS; School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK., Ingle RA; Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK. michael.parkes@ucl.ac.uk., Parkes MA; Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK. michael.parkes@ucl.ac.uk.
Jazyk:	angličtina
Zdroj:	Physical chemistry chemical physics : PCCP [Phys Chem Chem Phys] 2024 Nov 20; Vol. 26 (45), pp. 28406-28416. Date of Electronic Publication: 2024 Nov 20.
DOI:	10.1039/d4cp02952f
Abstrakt:	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 (<70 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.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu