Rotational excitation of interstellar molecules by electron impact

Details Rotational excitation of interstellar molecules by electron impact Rotational excitation of interstellar molecules by electron impact

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe.123f&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

Modelling_Interactions

Scientific paper

Electron-molecule collisions play a crucial role in astrophysical environments where the electron fraction is higher than about 1E-5, e.g. in the diffuse interstelar medium. We present here recent ab initio calculations of rate coefficients for electron-impact rotational excitation of HCN and HCO+. Our major results are i) the prediction of collisional propensity rules less rigorous than previously assumed and ii) the prediction of an excitation difference between ionic and neutral molecules at low temperatures.

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