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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2007

Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC

Alexandre Faure
Hemal N. Varambhia
  • Fonction : Auteur
Thierry Stoecklin
Jonathan Tennyson

Résumé

Rotational excitation of isotopologues of HCN and HNC by thermal electron-impact is studied using the molecular R-matrix method combined with the adiabatic-nuclei-rotation approximation. Rate coefficients are obtained for electron temperatures in the range 5-6000 K and for transitions among all levels up to J = 8. Hyperfine rates are also derived using the infinite-order-sudden scaling method. It is shown that the dominant rotational transitions are dipole-allowed, that is, those for which ΔJ = 1. The hyperfine propensity rule ΔJ = ΔF is found to be stronger than that in the case of He-HCN collisions. For dipole-allowed transitions, electron-impact rates are shown to exceed those for excitation of HCN by He atoms by six orders of magnitude. As a result, the present rates should be included in any detailed population model of isotopologues of HCN and HNC in sources where the electron fraction is larger than 10-6, for example, in interstellar shocks and comets.
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hal-00398428 , version 1 (15-12-2020)

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Alexandre Faure, Hemal N. Varambhia, Thierry Stoecklin, Jonathan Tennyson. Electron-impact rotational and hyperfine excitation of HCN, HNC, DCN and DNC. Monthly Notices of the Royal Astronomical Society, 2007, 382, pp.840. ⟨10.1111/j.1365-2966.2007.12416.x⟩. ⟨hal-00398428⟩
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