Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.397.1909b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 4, pp. 1909-1914.
Astronomy and Astrophysics
Astronomy
4
Molecular Data, Ism: Molecules
Scientific paper
The rates of rotational transitions for HCO+, the most abundant ion in interstellar space, induced by collision with helium are obtained for temperatures ranging from 10 to 80 K. The calculations are based on a new potential energy surface for the He-HCO+ interaction and on a scattering matrix whose accuracy was checked by pressure broadening and shift measurements. The rates decrease for increasing values of j and Δj, with a temperature trend depending on the energy involved in the transitions: if it is small, the rates are almost constant, while an increase with T is found for other cases. Comparison with previous and less accurate results shows an agreement within 50 per cent. Comparison between state-to-state and pressure broadening cross-sections allows us to discuss importance and influence of elastic and inelastic collisions.
Buffa Giovanni
Dore Luca
Meuwly Markus
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