Electron-impact rotational excitation of water

Details Electron-impact rotational excitation of water Electron-impact rotational excitation of water

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.347..323f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 347, Issue 1, pp. 323-333.

Astronomy and Astrophysics

Astronomy

32

Molecular Data, Molecular Processes, Ism: Molecules

Scientific paper

Rotational excitation of H2O, HDO and D2O by thermal electron impact is studied using the molecular R-matrix method. Rate coefficients are obtained up to electron temperatures of 8000 K. De-excitation rates and critical electron densities are also given. It is shown that the dominant transitions are those for which ΔJ= 0, +/-1, as predicted by the dipolar Born approximation. However, a pure Born treatment is found to overestimate the cross-sections close to threshold energies and to neglect important (dipole forbidden) transitions, owing to the importance of short-range and threshold effects. In the context of cometary water, the contribution of electron collisions might explain the need for large H2O-H2O collisional excitation rates in population models that neglect electrons.

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