Collisional excitation of H2 molecules by H atoms

Details Collisional excitation of H2 molecules by H atoms Collisional excitation of H2 molecules by H atoms

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...86..199m&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 86, no. 1, p. 199-210.

Astronomy and Astrophysics

Astrophysics

50

Atomic Collisions, Atomic Excitations, Hydrogen Atoms, Interstellar Gas, Molecular Collisions, Molecular Gases, Collision Rates, Electron Transitions, Potential Energy

Scientific paper

Three-dimensional quasi-classical trajectories on an accurate potential energy surface have been used to determine converged state-to-state rate constants for transitions among the low-energy (v, j) states of molecular hydrogen as the result of collision with atomic hydrogen in a warm gas. Where available, fully converged three-dimensional quantum cross sections have been incorporated into the evaluation of the rate constants. The temperature dependence of the rate constants has been parameterized over the temperature range 600-10,000 K. Critical densities and rates for ortho/para interconversion for the low-energy states are given at representative temperatures. Our results are compared with previous evaluations of rate constants for H + H2. Reactive and nonreactive transitions are considered separately, and the relative importance of various types of transition is discussed.

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