Abstract
State-resolved integral cross sections and corresponding thermal rate coefficients are computed for the HD + ortho -/ para -H 2 rotational energy transfer collision at low temperatures of astrophysical interest: 2 K ≲ T ≲ 300 K. A recent original full-dimensional H 2 -H2 potential energy surface (PES) was adopted and appropriately modified for the current non-symmetrical four-atomic system.
Highlights
One of the most important few-body systems in the field of atomic and molecular physics is, probably, the non-reactive scattering problem between two hydrogen molecules, i.e. H2+H2
Using the HD-H2 potential energy surface (PES) derived from the H2-H2 PES of Hinde [4] we carry out full quantum calculations for collisions of rotationally excited HD and H2 molecules, i.e. the process: HD( j1) + H2( j2) → HD( j1) + H2( j2)
In the case of the non-symmetrical HD+H2/D2 or HD+HD scattering systems, one should apply the original H2-H2 interaction field or PES, but in this case the propagation of the Schrödinger equation should run over the corrected Jacobi vector R3 which is directed over the new O Z axis
Summary
One of the most important few-body systems in the field of atomic and molecular physics is, probably, the non-reactive scattering problem between two hydrogen molecules, i.e. H2+H2. The scattering cross sections and their corresponding thermal rate coefficients are computed using a non-reactive quantum-mechanical close-coupling approach.
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