Collision-induced Dissociation of Molecular Hydrogen at Low Densities

Details Collision-induced Dissociation of Molecular Hydrogen at Low Densities Collision-induced Dissociation of Molecular Hydrogen at Low Densities

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...499..793m&link_type=abstract

Astrophysical Journal v.499, p.793

Astronomy and Astrophysics

Astronomy

36

Ism: Molecules, Molecular Data, Molecular Processes

Scientific paper

Quasi-classical trajectory studies have been carried out on a chemically accurate H4 potential-energy surface for H2 + H2 interactions to obtain cross sections for collision-induced dissociation (CID) from the H2(0, 0) ground vibration-rotation state. This is an important channel for dissociation, particularly in a low-density gas. These results are compared with corresponding calculations for the H + H2 and He + H2 systems. Collisions with the H2(0, 0) collision partner do not show the same dynamical elevation of threshold for CID seen previously for collisions with He. Despite the energetic threshold, H2(0, 0) is a much less effective collision partner in promoting CID than is H. Thermal rate coefficients for CID from the ground state are evaluated and compared to earlier approximations. A comparison with electron impact dissociation is also made.

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