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State-to-state rotational transitions rates of the HCO+ ion by collisions with helium
- Source :
- Monthly notices of the Royal Astronomical Society, 397 (2009): 1909–1914., info:cnr-pdr/source/autori:Buffa G.; Dore L.; Meuwley M./titolo:State-to-state rotational transitions rates of the HCO+ ion by collisions with helium/doi:/rivista:Monthly notices of the Royal Astronomical Society (Print)/anno:2009/pagina_da:1909/pagina_a:1914/intervallo_pagine:1909–1914/volume:397
- Publication Year :
- 2009
- Publisher :
- Blackwell Scientific Publications, Oxford , Regno Unito, 2009.
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Abstract
- 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 qjj' decrease for increasing values of j and j', 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.
- Subjects :
- molecular data
ISM: molecules
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Monthly notices of the Royal Astronomical Society, 397 (2009): 1909–1914., info:cnr-pdr/source/autori:Buffa G.; Dore L.; Meuwley M./titolo:State-to-state rotational transitions rates of the HCO+ ion by collisions with helium/doi:/rivista:Monthly notices of the Royal Astronomical Society (Print)/anno:2009/pagina_da:1909/pagina_a:1914/intervallo_pagine:1909–1914/volume:397
- Accession number :
- edsair.cnr...........33bbc533e81bf6580965e73a920a0429