Stark, G.
, Herde, H.
, Lyons, J.
, Heays, A.
, Oliveira, N.
, Nave, G.
, Lewis, B.
and Gibson, S.
(2018),
J. Chem. Phys. 148, 244302 (2018); https://doi.org/10.1063/1.5029929148, 244302© 2018 Author(s).Fourier-transform-spectroscopicphotoabsorption cross sections andoscillator strengths for theS2 B 3..u..X 3..g system, Journal of Chemical Physics, [online], https://aip.scitation.org/doi/pdf/10.1063/1.5029929, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925371
(Accessed October 17, 2025)
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J. Chem. Phys. 148, 244302 (2018); https://doi.org/10.1063/1.5029929148, 244302© 2018 Author(s).Fourier-transform-spectroscopicphotoabsorption cross sections andoscillator strengths for theS2 B 3..u..X 3..g system
Published
Author(s)
G. Stark, H. Herde, J. R. Lyons, A. N. Heays, N. Oliveira, , B. R. Lewis, S. T. Gibson
Abstract
Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands, v 11, in the S2 B 3..u .. X 3..g (v; 0) system are reported. Absorption measurements were undertaken of S2 vapor in a radio-frequency discharge through H2S seeded in helium and in a two-temperature sulfur furnace at temperatures of 37010 K and 82310 K, respectively. S2 column densities were determined in each source by combining experimental line strengths in low-v non-predissociating B ..X bands (v < 7) with calculated line f-values based on measured radiative lifetimes and calculated branching ratios. The broad-band capabilities of two vacuum-ultraviolet Fourier-transform spectrometers, used with instrumental resolutions of 0.22 cm..1 and 0.12 cm..1, allowed for simultaneous recordings of both non-predissociating and predissociating bands, thus placing the predissociating-band cross sections on a common absolute scale. Uncertainties in the nal cross-section datasets are estimated to be 15% for the 370-K vapor and 10% for the 823-K vapor. The experimental cross sections are used to inform a detailed predissociation model of the B(v) levels in an accompanying paper (following paper, this issue). For astrophysical and other applications, this model can be adjusted simply to provide isotopologue-speci c cross sections for a range of relevant temperatures.Citation
Journal of Chemical Physics
Volume
148
Pub Type
Journals
Keywords
Molecular spectra, ultraviolet spectra, vibrational analysis, Fourier transform spectroscopy, Absorption spectroscopy
Citation
Issues
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Created June 25, 2018, Updated October 12, 2021