Master Equation Studies of the Collisional Excitation and Dissociation of H2 Molecules by H Atoms

Details Master Equation Studies of the Collisional Excitation and Dissociation of H2 Molecules by H Atoms Master Equation Studies of the Collisional Excitation and Dissociation of H2 Molecules by H Atoms

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461..265m&link_type=abstract

Astrophysical Journal v.461, p.265

Astronomy and Astrophysics

Astronomy

62

Ism: Molecules, Molecular Processes, Molecular Data, Line: Formation

Scientific paper

The master equation for collisional excitation of H2 by H atoms is solved over a temperature range of T = 450-45,000 K and a density range of nH = 10-3-109 cm-3. Radiative transitions due to quadrupole emission and dissociative tunneling are included explicitly. The resulting nonequilibrium steady state populations of the (υ, j) states of H2 are determined and then used to calculate the rate coefficients for ortho-para interconversion, collisional dissociation, dissociative tunneling, and cooling. The density and temperature dependences of these rates are discussed and parameterized. Comparisons with previous estimates are made.

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