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Time resolved detection of the S(1D) product of the UV induced dissociation of CS2

Time resolved detection of the S(1D) product of the UV induced dissociation of CS2
Time resolved detection of the S(1D) product of the UV induced dissociation of CS2

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.

0021-9606
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045
Warne, Emily Maria
63799bdf-67fa-4dd8-adac-b963a9587a28
Smith, Adam David
af4cf6b6-1d87-47e7-a6f6-c8cc0ea20af8
Horke, Daniel
ecebf884-717c-4948-a62b-0533d4e04aa3
Springate, Emma
8135f8ae-8d23-45d1-81f6-5bb6d901e304
Jones, Alfred
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Cacho, Cephise
4bbb3d3f-210e-44d2-86e8-dde0db7032b3
Chapman, Richard
8a9fe0e2-c408-4188-bf10-e93bf247205c
Minns, Russell
85280db4-c5a6-4a4c-82fe-75693c6a6045
Warne, Emily Maria
63799bdf-67fa-4dd8-adac-b963a9587a28
Smith, Adam David
af4cf6b6-1d87-47e7-a6f6-c8cc0ea20af8
Horke, Daniel
ecebf884-717c-4948-a62b-0533d4e04aa3
Springate, Emma
8135f8ae-8d23-45d1-81f6-5bb6d901e304
Jones, Alfred
4ece66a8-5117-4d35-82e7-00204c3fe2e6
Cacho, Cephise
4bbb3d3f-210e-44d2-86e8-dde0db7032b3
Chapman, Richard
8a9fe0e2-c408-4188-bf10-e93bf247205c

Minns, Russell, Warne, Emily Maria, Smith, Adam David, Horke, Daniel, Springate, Emma, Jones, Alfred, Cacho, Cephise and Chapman, Richard (2021) Time resolved detection of the S(1D) product of the UV induced dissociation of CS2. The Journal of Chemical Physics, 154 (3), [034302]. (doi:10.1063/5.0035045).

Record type: Article

Abstract

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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CS2_S1D_JCP_Template_Unmarked - Accepted Manuscript
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More information

Accepted/In Press date: 26 December 2020
e-pub ahead of print date: 15 January 2021
Published date: 21 January 2021

Identifiers

Local EPrints ID: 446869
URI: http://eprints.soton.ac.uk/id/eprint/446869
ISSN: 0021-9606
PURE UUID: 3a69b318-4eff-494b-9339-007d04572f75
ORCID for Russell Minns: ORCID iD orcid.org/0000-0001-6775-2977

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Date deposited: 24 Feb 2021 17:34
Last modified: 25 Feb 2021 02:42

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