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Electronic excitation of carbonyl sulphide (COS) by high-resolution vacuum ultraviolet photoabsorption and electron-impact spectroscopy in the energy region from 4 to 11 eV

Limão-Vieira, P., Ferreira Da Silva, F., Almeida, D., Hoshino, M., Tanaka, H., Mogi, D., Tanioka, T., Mason, Nigel, Hoffmann, S.V., Hubin-Franskin, M.-J., and others. (2015) Electronic excitation of carbonyl sulphide (COS) by high-resolution vacuum ultraviolet photoabsorption and electron-impact spectroscopy in the energy region from 4 to 11 eV. Journal of Chemical Physics, 142 (6). Article Number 64303. ISSN 0021-9606. (doi:10.1063/1.4907200) (KAR id:74689)

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Abstract

The electronic state spectroscopy of carbonyl sulphide, COS, has been investigated using high resolution vacuum ultraviolet photoabsorption spectroscopy and electron energy loss spectroscopy in the energy range of 4.0-10.8 eV. The spectrum reveals several new features not previously reported in the literature. Vibronic structure has been observed, notably in the low energy absorption dipole forbidden band assigned to the (4π←3π) (1Δ←1Σ+) transition, with a new weak transition assigned to (1Σ-←1Σ+) reported here for the first time. The absolute optical oscillator strengths are determined for ground state to 1Σ+ and 1Π transitions. Based on our recent measurements of differential cross sections for the optically allowed (1Σ+ and 1Π) transitions of COS by electron impact, the optical oscillator strength f0 value and integral cross sections (ICSs) are derived by applying a generalized oscillator strength analysis. Subsequently, ICSs predicted by the scaling are confirmed down to 60 eV in the intermediate energy region. The measured absolute photoabsorption cross sections have been used to calculate the photolysis lifetime of carbonyl sulphide in the upper stratosphere (20-50 km).

Item Type: Article
DOI/Identification number: 10.1063/1.4907200
Uncontrolled keywords: Electron emission, Electron energy levels, Electron energy loss spectroscopy, Electron scattering, Energy dissipation, Ground state, Photolysis, Radiation, Differential cross section, Electronic excitation, Generalized oscillator strength, Integral cross-sections, Intermediate energy region, Optical oscillator strengths, Photoabsorption cross sections, Photoabsorption spectroscopy, Sulfur compounds
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Nigel Mason
Date Deposited: 03 Jul 2019 10:30 UTC
Last Modified: 19 Oct 2020 16:12 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/74689 (The current URI for this page, for reference purposes)
Mason, Nigel: https://orcid.org/0000-0002-4468-8324
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