Journal Article

Electron-impact rotational excitation of the carbon monosulphide (CS) molecule

Hemal N. Varambhia, Alexandre Faure, K. Graupner, Thomas A. Field and Jonathan Tennyson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 403, issue 3, pages 1409-1412
Published in print April 2010 | ISSN: 0035-8711
Published online April 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16207.x
Electron-impact rotational excitation of the carbon monosulphide (CS) molecule

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Rotational excitation of the carbon monosulphide (CS) molecule by thermal electron-impact is studied using the molecular -matrix method combined with the adiabatic-nuclei-rotation (ANR) approximation. Rate coefficients are obtained for electron temperatures in the range 5–5000 K and for transitions involving levels up to J= 40. It is confirmed that dipole allowed transitions (ΔJ= 1) are dominant and that the corresponding rate coefficients exceed those for excitation by neutrals by at least five orders of magnitude. As a result, the present rates should be included in any detailed population model of CS in sources where the electron fraction is larger than ∼10−5, in particular in diffuse molecular clouds and interstellar shocks.

Keywords: molecular data; molecular processes; scattering

Journal Article.  2415 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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