Ultracold collisions between two light indistinguishable diatomic molecules: elastic and rotational energy transfer in HD+HD
arXiv:1111.2598 · doi:10.1103/PhysRevA.85.052702
Abstract
A close coupling quantum-mechanical calculation is performed for rotational energy transfer in a HD+HD collision at very low energy, down to the ultracold temperatures: K. A global six-dimensional H-H potential energy surface is adopted from a previous work [Boothroyd {\it et al.}, J. Chem. Phys., {\bf 116}, 666 (2002).] State-resolved integral cross sections of different quantum-mechanical rotational transitions in the HD molecules and corresponding state-resolved thermal rate coefficients have been computed. Additionally, for comparison, H+H calculations for a few selected rotational transitions have also been performed. The hydrogen and deuterated hydrogen molecules are treated as rigid rotors in this work. A pronounced isotope effect is identified in the cross sections of these collisions at low and ultracold temperatures.
9 pages, 9 figures. Accepted for publication in Physical Review A
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