State-to-state rotational transitions rates of the HCO+ ion by collisions with helium (Articolo in rivista)

Type
Label
  • State-to-state rotational transitions rates of the HCO+ ion by collisions with helium (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Alternative label
  • Buffa G.; Dore L.; Meuwley M. (2009)
    State-to-state rotational transitions rates of the HCO+ ion by collisions with helium
    in Monthly notices of the Royal Astronomical Society (Print); Royal Society, London (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Buffa G.; Dore L.; Meuwley M. (literal)
Pagina inizio
  • 1909 (literal)
Pagina fine
  • 1914 (literal)
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  • 397 (literal)
Rivista
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  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Buffa G. IPCF -Pisa Dore L. Dipartimento di Chimica dell'Unoversità di Bologna (literal)
Titolo
  • State-to-state rotational transitions rates of the HCO+ ion by collisions with helium (literal)
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. (literal)
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