Ultraviolet photoabsorption in the B3S- - X3S- and C3p - X3S- band systems of SO sulphur isotopologues

0576657 - ÚFCH JH 2024 RIV GB eng J - Journal Article
Heays, Alan - Stark, G. - Lyons, J. R. - de Oliveira, N. - Lewis, B. R. - Gibson, S. T.
Ultraviolet photoabsorption in the B3S- - X3S- and C3p - X3S- band systems of SO sulphur isotopologues.
Molecular Physics. Roč. 121, č. 17-18 (2023), č. článku e2153092. ISSN 0026-8976. E-ISSN 1362-3028
R&D Projects: GA ČR GA19-03314S; GA MŠMT EF16_019/0000778
Grant - others:ERDF(CZ) CZ.02.1.01/0.0/0.0/16_019/0000778
Institutional support: RVO:61388955
Keywords : Ultraviolet spectroscopy * photoabsorption * predissociation * sulphur monoxide * isotopologues
OECD category: Physical chemistry
Impact factor: 1.7, year: 2022
Method of publishing: Limited access
https://www.tandfonline.com/doi/abs/10.1080/00268976.2022.2153092

High-resolution far-ultraviolet broadband Fourier-transform photoabsorption spectra of (SO)-S-32-O-16, (SO)-S-33-O-16,(SO)-S-34-O-16, and (SO)-S-36-O-16 are recorded in a microwave discharge seeded with SO2. The B-3 sigma(-)(v = 4 30) <- X-3 sigma(-)-(v = 0) and C-3 pi (v = 0 7) <- X-3 sigma(-)-(v = 0) bands are observed or inferred in the 43,000-51,000 cm-1 (196 to 233 nm) spectral range. This is the first experimental detection of a C-3 pi(v > 2) level and of any of these observed bands in an S-substituted isotopologue. Additional measurements of A(3)pi(v = 1 3) <- X-3 sigma(-)(v = 0) provide a calibration of the SO column density. Measured band profiles are fitted to an effective-Hamiltonian model of coupled excited B-3 sigma(-)- and C-3 pi states along with their predissociation linewidths and absorption band strengths. Electronic-state potential-energy curves and transition moments are deduced. The end result isa list of line fre-quencies, f-values, and dissociation widths describing the far-ultraviolet photodissociation spectrum of SO that is accurate enough for computing atmospheric photolytic isotope-fractionation. Linelists, and photoabsorption and photodissociation cross sections are available as supplementary data.
Permanent Link: https://hdl.handle.net/11104/0347412