A Faure et al 2009 J. Phys.: Conf. Ser. 192 012016 doi:10.1088/1742-6596/192/1/012016
Rotational excitation of interstellar molecular ions by electrons
A Faure1, J Tennyson2, V Kokoouline3 and Chris H Greene4
Show affiliationsElectrons are known to be efficient in rotationally exciting molecular ions in cold ionized media. Rotational effects have also been shown to affect the dissociative recombination (DR) process. Electron collisions are thus expected to play a significant role in the thermalization and dissociation dynamics of molecular ions, both in the laboratory and in space. Using the molecular R-matrix method combined with the Adiabatic-Nuclei-Rotation (ANR) approximation corrected for threshold and closed-channel effects, we have computed new rate coefficients for the rotational excitation of H+3 and HCO+ by electrons at temperatures from 10 to 1 000K. At temperatures above rotational thresholds, rotational rates are found to compete or even dominate those of dissociative recombination, suggesting that electron collisions provide a possible source of rotational (de)excitation in DR measurements.
- PACS
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34.80.Lx Recombination, attachment, and positronium formation
34.80.Ht Dissociation and dissociative attachment
31.15.-p Calculations and mathematical techniques in atomic and molecular physics
- Subjects
- Dates
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Issue 1 (2009)
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Rotational excitation of interstellar molecular ions by electrons
A Faure et al 2009 J. Phys.: Conf. Ser. 192 012016
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