Influence of vibrational continuum states on vibrational transitions among bound states of H2molecule by H atom impact

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Abstract
The influence of coupling between vibrational bound and continuum states on vibrational transitions among bound states of H2 molecule in the electronic ground state caused by H atom impact is theoretically investigated by solving the vibrational close-coupling equations under the rotational IOS approximation. It is found that the coupling between the bound and continuum states causes a noticeable change in the integrated cross sections for the vibrational transitions with Delta nu = mod nu i- nu f mod mainly larger than 4 or 5, and has a non-negligible influence on the total vibrationally inelastic scattering cross sections for the molecule in the high-lying vibrationally excited states, although the vibrationally elastic and the total scattering cross sections are little affected. This coupling generally makes the de-excitation cross sections small and the excitation cross sections large compared with the results obtained by the calculations without the continuum states.