State-resolved rotational cross sections and thermal rate coefficients for ortho-/para-H2+HD at low temperatures and HD+HD elastic scattering

Abstract

Results for quantum mechanical calculations of the integral cross sections and corresponding thermal rate coefficients for para-/ortho-H2+HD collisions are presented. Because of significant astrophysical interest in regard to the cooling of primodial gas the low temperature limit of para-/ortho-H2+HD is investigated. Sharp resonances in the rotational state-resolved cross sections have been calculated at low energies. These resonances are important and significantly contribute to the corresponding rotational state-resolved thermal rate coefficients, particularly at low temperatures, that is less than $T\sim 100$K. Additionally in this work, the cross sections for the elastic HD+HD collision have also been calculated. We obtained quite satisfactory agreement with the results of other theoretical works and experiments.

16 pages, 5 figures, additional results included

References in corpus (5)

• The First Stars
• Rotational quenching rate coefficients for H_2 in collisions with H_2 from 2 to 10,000 K
• State resolved rotational excitation cross sections and rates in H2+H2 collisions
• Rotational Energy Transfer in H2+H2
• Close-coupling calculations of rotational energy transfer in p-H2+HD

Cited by in corpus (4)

• Low temperature HD + $ortho$-/$para$-H${}_2$ inelastic scattering of astrophysical interest
• A comparative study of the low energy HD+o-/p-H2 rotational excitation/de-excitation collisions and elastic scattering
• Ultracold collisions between two light indistinguishable diatomic molecules: elastic and rotational energy transfer in HD+HD
• Quenching of $para$-H${}_2$ with an ultra-cold anti-hydrogen atom ${\bar{H}}_{1s}$