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The rotational excitation of methanol by para-hydrogen.

Pottage, J. T. and Flower, D. R. and Davis, S. L. (2004) 'The rotational excitation of methanol by para-hydrogen.', Monthly notices of the Royal Astronomical Society., 352 (1). pp. 39-43.


In this paper, we present the results of calculations of cross-sections and rate coefficients for rotationally inelastic transitions in methanol (CH3OH), in its ground torsional state, induced by collisions with para-H2 in its ground rotational state. The interaction potential was calculated by means of many-body perturbation theory, and the corresponding cross-sections computed using the coupled states approximation to the Schrödinger equation for the CH3OH–H2 system. The rate coefficients have been calculated for kinetic temperatures in the range 5 ≤T≤ 200 K. We found that, although the rate coefficients for para-H2 are qualitatively similar to those computed for He, the collisional propensity rules are less pronounced when the perturber is para-H2 than when it is He. The rate coefficients for CH3OH–H2 tend to be larger than for CH3OH–He, a tendency which is anticipated from a comparison of the corresponding interaction potentials. Although our discussion is in terms of E-type methanol, the analogous results for A-type methanol and para-H2 are also available. Our calculations are the first to consider H2 as a collision partner for CH3OH and are directly relevant to the interpretation of observations of methanol in the interstellar medium.

Item Type:Article
Additional Information:
Keywords:Molecular data, Molecular processes, Molecules, ISM.
Full text:Full text not available from this repository.
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Date accepted:No date available
Date deposited:No date available
Date of first online publication:July 2004
Date first made open access:No date available

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