The demand for electron-impact cross sections has increased tremendously in recent years. There is, however, a special interest in such cross sections for hydrogen molecules and its isotopomers, HD and D 2 , because of their presence in tokamak edge plasmas, planetary atmospheres and at different astrophysical sites. This explains the need for having well validated sets of electron-impact cross sections for different processes. This work reviews the electron-scattering cross sections for elastic and inelastic processes at different electron energies for both these molecules. The elastic momentum transfer cross sections and inelastic cross sections for electron-impact rotational, vibrational and electronic excitation, emission, dissociation, ionization and dissociative electron attachment have been evaluated and well validated in this work wherever and whenever possible.

The basic problem of an intense light pulse pistoning into a plasma ('holeboring' (HB) radiation pressure acceleration) when there are multiple ion species is re-examined. An alternative analytical treatment of the problem is presented, and it is argued that the HB dynamics are determined by the light intensity and composite (i.e. total) mass density of the target alone. Onedimensional numerical simulations are used to validate this theory, and it is shown that it correctly predicts the dependence on composite mass density, charge state and numerical proportion of the species. Only in certain extreme cases is the analytical model found to be inadequate. These results challenge previous findings.

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