Rotational energy transfer in H+H2(v) inelastic collisions

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Abstract
Quasiclassical trajectory calculations have been carried out at translational energies between 0.2 and 0.8 eV on H+H2(v), v=1, 2, 3, using the accurate SLTH potential surface. Integral and differential cross sections are given for the lowest rotationally inelastic collision Δj=2. The mean polarization angle as a function of impact parameter for this same transition is also studied. It is found that the integral cross section reflects the shape of the repulsive part of the potential. The differential cross sections display rotational rainbows. In most cases these are of the ‘‘repulsive’’ type. However, for the v=3 at high T, the rainbows are of the ‘‘attractive’’ type. The polarization data is found not to be a good probe of the attractive well.

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