Inelastic collisions between an atom and a diatomic molecule. III. Comparison of approximation methods as applied to the H+H2 rotational excitation

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Abstract
The close coupling method is used to calculate the rotational excitation cross sections of H+H2 collisions. On the potential surface suggested by Chu and Dalgarno, close coupling results are compared with results of distorted wave Born approximation and of effective close coupling approximation. On the potential surface suggested by McGuire and Krüger, close coupling results are compared with results of DWBA and of Jz‐conserving coupled states approximation. The simple DWBA is generally adequate for this system, and in some cases, it is much better than other approximation methods. A third potential based on the experimental V0 of Gegenbach, Hahn, and Toennies and the nonempirical V2 of Norbeck, Certain, and Tang is also used. The excitation cross sections are smaller by orders‐of‐magnitude than the ones determined on the other two surfaces.