Abstract
The temperature dependence of effective Waldmann–Snider cross sections determining relaxation and line broadening phenomena has been studied for p-H2 between 20 and 200 K. In particular, the rotational relaxation cross section and the relaxation cross sections of the rotational angular momentum vector and tensor polarizations and their respective fluxes have been calculated in an entirely ab initio treatment and close coupling formalism. As far as experimental results were available, quantitative agreement has been obtained. The rotational relaxation cross section has been proven to be quite sensitive to the potential anisotropy. Furthermore, the validity of some approximate relations between effective cross sections has been tested.
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