2024/01/19 by Frances M. Gomez, Robert J. Hargreaves, Gomez, Frances M. +3
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Advanced Chemical Physics Studies #Atmospheric Ozone and Climate #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Spectroscopy and Laser Applications
paper · pdf · doi:10.48550/arxiv.2401.10782
openalex publication_date 2024/01/19 · openalex created_date 2024/01/23 · openalex updated_date 2026/07/28
The sulfur dimer (S2) is an important molecular constituent in cometary atmospheres and volcanic plumes on Jupiter's moon Io. It is also expected to play an important role in the photochemistry of exoplanets. The UV spectrum of S2 contains transitions between vibronic levels above and below the dissociation limit, giving rise to a distinctive spectral signature. By using spectroscopic information from the literature, and the spectral simulation program PGOPHER, a UV line list of S2 is provided. This line list includes the primary B 3Σ-u-X 3Σ-g (v'=0-27, v''=0-10) electronic transition, where vibrational bands with v'≥10 are predissociated. Intensities have been calculated from existing experimental and theoretical oscillator strengths, and semi-empirical strengths for the predissociated bands of S2 have been derived from comparisons with experimental cross-sections. The S2 line list also includes the B'' 3Πu-X 3Σ-g (v'=0-19, v''=0-10) vibronic bands due to the strong interaction with the B state. In summary, we present the new HITRAN-formatted S2 line list and its validation against existing laboratory spectra. The extensive line list covers the spectral range 21700-41300~cm-1 (∼242-461~nm) and can be used for modeling both absorption and emission.