Rovibrational excitation of molecular hydrogen by helium

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Abstract
The authors present the results of close-coupling calculations of cross sections for rovibrational excitation of para-H2 by He at a collision energy midway between the first and second excited vibrational excitation thresholds. Green's MOLSCAT computer program was employed. The authors' results are found to be in excellent agreement with previous computations of partial-wave cross sections by Easts and Secrest (1972), given the potential and basis set, but large discrepancies are found with the more recent calculations of Lin and Secrest (1970). Structures in the energy variation of pure rotational excitation cross sections, attributed by these authors to the opening of the first vibrational threshold, are absent in the authors' calculations.