Fulltext

Collisional excitation rate coefficients of N2H+ by He

Daniel, F. ; Dubernet, M.-L ; Meuwly, M. ; Cernicharo, J. ; Pagani, L.

In: Monthly Notices of the Royal Astronomical Society, 2005, vol. 363, no. 4, p. 1083-1091

Ajouter à la liste personnelle
    Titre
    • Collisional excitation rate coefficients of N2H+ by He
    Auteur
    • Daniel, F.. Observatoire de Paris-Meudon, LERMA UMR CNRS 8112, 5, Place Jules Janssen, F-92195 Meudon Cedex, France
    • Dubernet, M.-L. Observatoire de Paris-Meudon, LERMA UMR CNRS 8112, 5, Place Jules Janssen, F-92195 Meudon Cedex, France
    • Meuwly, M.. Department of Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel, Switzerland
    • Cernicharo, J.. DAMIR-IEM-CSIC, C/Serrano, 113-121, 28006 Madrid, Spain
    • Pagani, L.. Observatoire de Paris-Meudon, LERMA UMR CNRS 8112, 5, Place Jules Janssen, F-92195 Meudon Cedex, France
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2005, vol. 363, no. 4, p. 1083-1091. Blackwell Science Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:294172
    Summary
    Using a recoupling technique with close-coupling spin-free calculations de-excitation rate coefficients are obtained among hyperfine transitions for He colliding with N2H+. A recently determined potential energy surface suitable for scattering calculations is used to investigate rate coefficients for temperatures between 5 and 50 K, and for the seven lowest rotational levels of N2H+. Fitting functions are provided for the Maxwellian averaged opacity tensors and for the rotational de-excitation collisional rate coefficients. The fitting functions for the opacity tensors can be used to calculate hyperfine (de)-excitation rate coefficients among elastic and inelastic rotational levels, and among the corresponding magnetic sublevels of the hyperfine structure. Certain dynamical approximations are investigated and found to be invalid