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Collisional excitation rate coefficients of N2H+ by He
Article first published online: 30 SEP 2005
DOI: 10.1111/j.1365-2966.2005.09542.x
Issue
Monthly Notices of the Royal Astronomical Society
Volume 363, Issue 4, pages 1083–1091, November 2005
Additional Information
How to Cite
Daniel, F., Dubernet, M.-L., Meuwly, M., Cernicharo, J. and Pagani, L. (2005), Collisional excitation rate coefficients of N2H+ by He. Monthly Notices of the Royal Astronomical Society, 363: 1083–1091. doi: 10.1111/j.1365-2966.2005.09542.x
Publication History
- Issue published online: 6 OCT 2005
- Article first published online: 30 SEP 2005
- Accepted 2005 August 18. Received 2005 August 18; in original form 2005 April 11
- Abstract
- Article
- References
- Cited By
Keywords:
- molecular data;
- molecular processes;
- methods: numerical;
- ISM: molecules
ABSTRACT
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.