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Improved low-temperature rate constants for rotational excitation of CO by H_2 | | M. Wernli
; P. Valiron
; A. Faure
; L. Wiesenfeld
; P. Jankowski
; K. Szalewicz
; | | Date: |
18 Jan 2006 | | Journal: | Astron.Astrophys. 446 (2006) 367-372 | | Abstract: | 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. | | Source: | arXiv, astro-ph/0601384 | | Services: | Forum | Review | PDF | Favorites | |
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