Improved low-temperature rate constants for rotational excitation of CO by H_2

Details Improved low-temperature rate constants for rotational excitation of CO by H_2 Improved low-temperature rate constants for rotational excitation of CO by H_2

2006-01-18

arxiv.org/abs/astro-ph/0601384v1

Astron.Astrophys.446:367-372,2006

Astronomy and Astrophysics

Astrophysics

8 pages, including 2 "online material" pages, 2 figures

Scientific paper

10.1051/0004-6361:20053919

Cross sections for the rotational (de)excitation of CO by ground state para- and ortho-H_2 are obtained using quantum scattering calculations for collision energies between 1 and 520 cm^{-1}. A new CO-H_2 potential energy surface is employed and its quality is assessed by comparison with explicitly correlated CCSD(T)-R12 calculations. Rate constants for rotational levels of CO up to 5 and temperatures in the range 5-70 K are deduced. The new potential is found to have a strong influence on the resonance structure of the cross sections at very low collision energies. As a result, the present rates at 10 K differ by up to 50% with those obtained by \citet{flower01} on a previous, less accurate, potential energy surface.

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