Electron-impact excitation of interstellar molecules

Details Electron-impact excitation of interstellar molecules Electron-impact excitation of interstellar molecules

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..244f&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

Electron-impact excitation of molecules plays a crucial role in astrophysical environments where the electron fraction is higher than about 10-5, e.g. in the diffuse interstelar medium, in shocks and comets. We present here recent ab initio calculations of rate coefficients for the rotational excitation of HCN and HCO^+ by thermal electrons. Our calculations are based on the molecular R-matrix method combined with the Adiabatic-Nuclei-Rotation (ANR) approximation corrected for threshold effects. Our major results are i) the prediction of collisional propensity rules less rigorous than previously assumed and ii) the prediction of significant excitation differences between ionic and neutral molecules.

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