Rotationally inelastic scattering of hydrogen molecules and the non-spherical interaction

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Abstract
Molecular-beam scattering experiments on state-to-state differential cross-sections for rotational transitions of hydrogen molecules are a sensitive probe for both the isotropic and the anisotropic interaction potential with other atoms and molecules. New experimental results on the weakly coupled system D2+ Ar allow reliable determination of the repulsive part of the complete potential. It is compared with the well known D2–Ne 2 potential and recently proposed model potentials which predict the general behaviour but not the details. For the important H2–H2 interaction differential cross-sections for 0→2 transitions in HD + D2 and D2+ H2 collisions are presented. The evaluation of these data leads to repulsive anisotropic potential terms which show the same shift of 0.1 Å to smaller R-values with respect to the best ab initio calculation found previously for the isotropic interaction.