Fine-structure resolved rovibrational transitions for so + H2collisions

Teri J. Price, Robert C. Forrey, Benhui Yang, Phillip C. Stancil

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Cross sections and rate coefficients for sulfur monoxide (SO) + H2 collisions are calculated using a full six-dimensional (6D) potential energy surface (PES). The coupled states (CS) approximation is used to compute fine-structure resolved cross sections for rovibrational transitions between states with v = 0-2, where v is the vibrational quantum number of the SO molecule. The CS calculations for Δv = 1 are benchmarked against close-coupling (CC) results for spin-free interactions. For Δv = 0, the present fine-structure resolved CS results are benchmarked against existing CC results obtained with a rigid rotor approximation. In both cases, the agreement is found to be satisfactory, which suggests that the present results may provide reliable estimates for fine-structure resolved rovibrational transitions. These estimates are the first of their kind based on a full 6D PES. Rate coefficients are reported for temperatures between 10 K and 3000 K for both para- and ortho-H2 colliders. A comparison of the para-H2 rates with mass-scaled results for He shows substantial differences that may be important in astrophysical models.

Original languageEnglish (US)
Article number034301
JournalJournal of Chemical Physics
Issue number3
StatePublished - Jan 21 2021

All Science Journal Classification (ASJC) codes

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


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