Collisional excitation of interstellar molecules. III - The effective straight-line trajectory approach

Details Collisional excitation of interstellar molecules. III - The effective straight-line trajectory approach Collisional excitation of interstellar molecules. III - The effective straight-line trajectory approach

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.100..129k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 100, no. 1-2, March 1984, p. 129-148. Research supported by the Indian Spa

Astronomy and Astrophysics

Astrophysics

5

Interstellar Gas, Molecular Collisions, Molecular Excitation, Trajectory Analysis, Collision Rates, Extremum Values, Molecular Gases, Molecular Spectra, Particle Trajectories, Spectral Line Width

Scientific paper

Collision-induced rotational line widths and excitation states, in the cases of (1) an atom-molecule system conforming to the Smith et al. (1976) formalism and (2) molecule-molecule systems in the framework of a normalized semiclassical perturbative approach, are calculated by means of an effective straight line trajectory (EST) method. The EST approach is tested for the case of the HCl-Ar system, and is then applied to the interstellar systems, CO-He, CO-H2, and OCS-H2. The results obtained are in agreement with theoretical computations employing a semiperturbative approach. The EST method yields significant information about the lower and upper bounds of the collision-induced rates, even in the case of perturbers in rotationally excited states, and can be generalized for vibrational-electronic excitations.

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