Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 B Σ u - 3 - X Σ g - 3 system

G. Stark, H. Herde, James Lyons, A. N. Heays, N. De Oliveira, G. Nave, B. R. Lewis, S. T. Gibson

Research output: Contribution to journalArticle

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Abstract

Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands, v ≥ 11, in the S2 BΣu-3-XΣg-3(v,0) system are reported. Absorption measurements were undertaken on S2 vapor produced by a radio-frequency discharge through H2S seeded in helium, and also in a two-temperature sulfur furnace, at temperatures of 370 K and 823 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, respectively, 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 final 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 Paper II [Lewis et al., J. Chem. Phys. 148, 244303 (2018)]. For astrophysical and other applications, this model can be adjusted simply to provide isotopologue-specific cross sections for a range of relevant temperatures.

Original languageEnglish (US)
Article number244302
JournalJournal of Chemical Physics
Volume148
Issue number24
DOIs
StatePublished - Jun 28 2018

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photoabsorption
oscillator strengths
Fourier transforms
Vapors
cross sections
vapors
Helium
Sulfur
Discharge (fluid mechanics)
Temperature
Spectrometers
Furnaces
radio frequency discharge
Vacuum
radiative lifetime
superhigh frequencies
furnaces
temperature
astrophysics
sulfur

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 B Σ u - 3 - X Σ g - 3 system. / Stark, G.; Herde, H.; Lyons, James; Heays, A. N.; De Oliveira, N.; Nave, G.; Lewis, B. R.; Gibson, S. T.

In: Journal of Chemical Physics, Vol. 148, No. 24, 244302, 28.06.2018.

Research output: Contribution to journalArticle

Stark, G. ; Herde, H. ; Lyons, James ; Heays, A. N. ; De Oliveira, N. ; Nave, G. ; Lewis, B. R. ; Gibson, S. T. / Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 B Σ u - 3 - X Σ g - 3 system. In: Journal of Chemical Physics. 2018 ; Vol. 148, No. 24.
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