Electron collisional excitation of rotational transitions in CH/+/ and HeH/+/

Details Electron collisional excitation of rotational transitions in CH/+/ and HeH/+/ Electron collisional excitation of rotational transitions in CH/+/ and HeH/+/

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..237f&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 1-2, Mar. 1979, p. 237-239.

Astronomy and Astrophysics

Astrophysics

7

Electron Scattering, Interstellar Gas, Molecular Excitation, Molecular Ions, Molecular Rotation, Born Approximation, Electron Energy, Hydrocarbons, Hydrogen Ions, Low Temperature, Scattering Cross Sections

Scientific paper

Semiclassical and quantum-mechanical calculations of the cross section for electron collisional excitation of the first rotational transition of CH(+) are compared. It is found that the semiclassical approximation is sufficiently accurate at collision energies down to twice the threshold value. Collision strength is shown to be a more convenient parameter than cross section when evaluating the integral over a Maxwellian velocity distribution for the colliding electrons. It is concluded that the semiclassical results obtained for the electron collisional excitation rate of HeH(+) may also be expected to be quite accurate in the energy range relevant to studies of ionized nebulae.

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