Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.325..443f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 325, Issue 1, pp. 443-448.
Astronomy and Astrophysics
Astronomy
35
Molecular Data, Molecular Processes, Ism: Molecules
Scientific paper
Molecular R-matrix calculations are performed to give rotational excitation rates for electron collisions with linear molecular ions. Results are presented for CO+, HCO+, NO+ and H2+ up to electron temperatures of 10000K. De-excitation rates and critical electron densities are also given. It is shown that the widely used Coulomb-Born approximation is valid for Δj=1 transitions when the molecular ion has a dipole greater than about 2D, but otherwise is not reliable for studying electron-impact rotational excitation. In particular, transitions with Δj>1 are found to have appreciable rates and are found to be entirely dominated by short-range effects.
Faure Alexandre
Tennyson Jonathan
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