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Title:
Rotational excitation of CO by collisions with He, H, and H2 under conditions in interstellar clouds
Authors:
Green, S.; Thaddeus, P.
Affiliation:
AA(NASA, Goddard Institute for Space Studies, New York, N.Y.), AB(NASA, Goddard Institute for Space Studies, New York, N.Y.)
Publication:
Astrophysical Journal, vol. 205, May 1, 1976, pt. 1, p. 766-785. (ApJ Homepage)
Publication Date:
05/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CARBON MONOXIDE, CLOUD PHYSICS, INTERSTELLAR GAS, MOLECULAR EXCITATION, SCATTERING CROSS SECTIONS, INTERSTELLAR MATTER, PRESSURE BROADENING, QUANTUM THEORY, S MATRIX THEORY, VELOCITY DISTRIBUTION
Comment:
A&AA ID. AAA017.131.113
DOI:
10.1086/154333
Bibliographic Code:
1976ApJ...205..766G

Abstract

Cross sections for rotational excitation of small molecules by low-energy collisions with helium and hydrogen can currently be obtained via accurate numerical solution of the quantum equations that describe both intermolecular forces and collision dynamics. The relevant methods are discussed in some detail and applied to compute excitation rates for carbon monoxide. These calculations also predict collision-induced spectral pressure-broadening constants which are in excellent agreement with available experimental data.

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