The products formed following the photodissociation of UV (200 nm) excited CS2 are monitored in a time resolved photoelectron spectroscopy experiment using femtosecond XUV (21.5 eV) photons. By spectrally resolving the electrons, we identify separate photoelectron bands related to the CS2 + hν → S(1D) + CS and CS2 + hν → S(3P) + CS dissociation channels, which show different appearance and rise times. The measurements show that there is no delay in the appearance of the S(1D) product contrary to the results of Horio et al. [J. Chem. Phys. 147, 013932 (2017)]. Analysis of the photoelectron yield associated with the atomic products allows us to obtain a S(3P)/S(1D) branching ratio and the rate constants associated with dissociation and intersystem crossing rather than the effective lifetime observed through the measurement of excited state populations alone.
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21 January 2021
Research Article|
January 15 2021
Time resolved detection of the S(1D) product of the UV induced dissociation of CS2
Emily M. Warne
;
Emily M. Warne
1
School of Chemistry, University of Southampton
, Highfield, Southampton SO17 1BJ, United Kingdom
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Adam D. Smith;
Adam D. Smith
1
School of Chemistry, University of Southampton
, Highfield, Southampton SO17 1BJ, United Kingdom
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Daniel A. Horke
;
Daniel A. Horke
2
Institute for Molecules and Materials, Radboud University
, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
3
Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY
, Notkestrasse 85, 22607 Hamburg, Germany
4
The Hamburg Centre for Ultrafast Imaging, Universität Hamburg
, Luruper Chaussee 149, 22761 Hamburg, Germany
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Emma Springate
;
Emma Springate
5
Central Laser Facility, STFC Rutherford Appleton Laboratory
, Didcot, Oxfordshire OX11 0QX, United Kingdom
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Alfred J. H. Jones
;
Alfred J. H. Jones
5
Central Laser Facility, STFC Rutherford Appleton Laboratory
, Didcot, Oxfordshire OX11 0QX, United Kingdom
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Cephise Cacho;
Cephise Cacho
5
Central Laser Facility, STFC Rutherford Appleton Laboratory
, Didcot, Oxfordshire OX11 0QX, United Kingdom
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Richard T. Chapman
;
Richard T. Chapman
5
Central Laser Facility, STFC Rutherford Appleton Laboratory
, Didcot, Oxfordshire OX11 0QX, United Kingdom
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Russell S. Minns
Russell S. Minns
a)
1
School of Chemistry, University of Southampton
, Highfield, Southampton SO17 1BJ, United Kingdom
a)Author to whom correspondence should be addressed: r.s.minns@soton.ac.uk
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a)Author to whom correspondence should be addressed: r.s.minns@soton.ac.uk
J. Chem. Phys. 154, 034302 (2021)
Article history
Received:
October 26 2020
Accepted:
December 26 2020
Citation
Emily M. Warne, Adam D. Smith, Daniel A. Horke, Emma Springate, Alfred J. H. Jones, Cephise Cacho, Richard T. Chapman, Russell S. Minns; Time resolved detection of the S(1D) product of the UV induced dissociation of CS2. J. Chem. Phys. 21 January 2021; 154 (3): 034302. https://doi.org/10.1063/5.0035045
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