Electron-impact excitation of interstellar molecules

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

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..363f&link_type=abstract

In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A

Astronomy and Astrophysics

Astrophysics

Molecular Data, Molecular Processes, Ism

Scientific paper

Electron-molecule collisions play a crucial role in astrophysical environments where the electron fraction is higher than about 10-5, e.g. in the diffuse ISM, PDRs or comets. We present here a brief review of our recent R-matrix calculations of rate coefficients for electron-impact excitation of interstellar molecules. Our major result is the prediction of emission lines from higher rotational states than previously assumed. Rate coefficients for transitions with Δj > 1 are indeed found to be significant and in some cases larger than those with Δj = 1, the only ones considered previously. This reflects the importance of short-range interactions which are ignored in the standard theories. Illustrative results are presented for CH+, H3+ and H2O.

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