QUANTUM CALCULATION of INELASTIC CO COLLISIONS with H. II. PURE ROTATIONAL QUENCHING of HIGH ROTATIONAL LEVELS

Kyle M. Walker, L. Song, B. H. Yang, G. C. Groenenboom, A. Van Der Avoird, N. Balakrishnan, R. C. Forrey, P. C. Stancil

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Carbon monoxide is a simple molecule present in many astrophysical environments, and collisional excitation rate coefficients due to the dominant collision partners are necessary to accurately predict spectral line intensities and extract astrophysical parameters. We report new quantum scattering calculations for rotational deexcitation transitions of CO induced by H using the three-dimensional potential energy surface (PES) of Song et al. State-to-state cross sections for collision energies from 10-5 to 15,000 cm-1 and rate coefficients for temperatures ranging from 1 to 3000 K are obtained for CO (v = 0, j) deexcitation from to all lower j′ levels, where j is the rotational quantum number. Close-coupling and coupled-states calculations were performed in full-dimension for , 10, 15, 20, 25, 30, 35, 40, and 45 while scaling approaches were used to estimate rate coefficients for all other intermediate rotational states. The current rate coefficients are compared with previous scattering results using earlier PESs. Astrophysical applications of the current results are briefly discussed.

Original languageEnglish (US)
Article number27
JournalAstrophysical Journal
Volume811
Issue number1
DOIs
StatePublished - Sep 20 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Walker, K. M., Song, L., Yang, B. H., Groenenboom, G. C., Avoird, A. V. D., Balakrishnan, N., Forrey, R. C., & Stancil, P. C. (2015). QUANTUM CALCULATION of INELASTIC CO COLLISIONS with H. II. PURE ROTATIONAL QUENCHING of HIGH ROTATIONAL LEVELS. Astrophysical Journal, 811(1), [27]. https://doi.org/10.1088/0004-637X/811/1/27