Fine-structure resolved rotational transitions and database for CN+H2 collisions

Hannah Burton, Ryan Mysliwiec, Robert C. Forrey, B. H. Yang, P. C. Stancil, N. Balakrishnan

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Cross sections and rate coefficients for CN+H2 collisions are calculated using the coupled states (CS) approximation. The calculations are benchmarked against more accurate close-coupling (CC) calculations for transitions between low-lying rotational states. Comparisons are made between the two formulations for collision energies greater than 10 cm−1. The CS approximation is used to construct a database which includes highly excited rotational states that are beyond the practical limitations of the CC method. The database includes fine-structure resolved rotational quenching transitions for v=0 and j ≤ 40, where v and j are the vibrational and rotational quantum numbers of the initial state of the CN molecule. Rate coefficients are computed for both para-H2 and ortho-H2 colliders. The results are shown to be in good agreement with previous calculations, however, the rates are substantially different from mass-scaled CN+He rates that are often used in astrophysical models.

Original languageEnglish (US)
Pages (from-to)23-32
Number of pages10
JournalMolecular Astrophysics
Volume11
DOIs
StatePublished - Jun 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Space and Planetary Science

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