期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 382, 期 2, 页码 840-848出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2007.12416.x
关键词
molecular data; molecular processes; ISM : molecules
资金
- STFC [PP/D001269/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D001269/1] Funding Source: researchfish
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 Delta J = 1. The hyperfine propensity rule Delta J = Delta F 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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