Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258l..79b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 258, July 15, 1982, p. L79-L81. Research supported by the U.S. Depar
Astronomy and Astrophysics
Astrophysics
12
Atomic Collisions, Gas Dissociation, Interstellar Gas, Molecular Clouds, Molecular Collisions, Shock Fronts, Molecular Energy Levels, Molecular Excitation, Molecular Rotation, Molecular Trajectories, Monte Carlo Method
Scientific paper
New calculations are reported for the H + H2 (v,j) to 3H transition, where v and j are vibrational and rotational quantum numbers, at relative translational speeds 45-93 km/s for v = 0 and j = 6 and at a relative translation temperature of 4500 K for v = 0,1 and j = 0-30. The calculations are performed by the standard quasi-classical trajectory method, and at the end of each trajectory, the outcome is analyzed as complete dissociation, quasi-bound state, or bound state. The initial collision conditions are representative of those in molecular clouds behind high-speed shock fronts. The collision-induced dissociation cross section appears to have a classical dynamic threshold about 1 eV above the energetic threshold and to plateau at about 10 to the -20 sq m. Some state-selected rate constants for a relative translational temperature of 4500 K are also presented.
Blais N. C.
Truhlar D. G.
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