Quantum calculation of inelastic CO collisions with H. II. Pure rotational quenching of high rotational levels

Journal Article · Sun Sep 20 00:00:00 EDT 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/811/1/27· OSTI ID:22882625

Walker, Kyle M.; Yang, B. H.; Stancil, P. C. ^[1]; Song, L.; Groenenboom, G. C.; Avoird, A. van der ^[2]; Balakrishnan, N. ^[3]; Forrey, R. C. ^[4]

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1. Department of Physics and Astronomy and Center for Simulational Physics, The University of Georgia, Athens, GA 30602 (United States)
2. Theoretical Chemistry, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen (Netherlands)
3. Department of Chemistry, University of Nevada Las Vegas, NV 89154 (United States)
4. Department of Physics, Penn State University, Berks Campus, Reading, PA 19610 (United States)

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{sup −5} to 15,000 cm{sup −1} and rate coefficients for temperatures ranging from 1 to 3000 K are obtained for CO (v = 0, j) deexcitation from j=1−45 to all lower j′ levels, where j is the rotational quantum number. Close-coupling and coupled-states calculations were performed in full-dimension for j=1−5, 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.

• OSTI ID: 22882625
• Journal Information: Astrophysical Journal, Vol. 811, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
CARBON MONOXIDE
COMPARATIVE EVALUATIONS
CROSS SECTIONS
EXCITATION
MOLECULES
QUANTUM NUMBERS
ROTATIONAL STATES
THREE-DIMENSIONAL CALCULATIONS