Abstract
Two nonperturbative methods are applied to obtain total and singly differential (in the electron energy) cross sections of electron emission in proton collisions with H${}_{2}$O at impact energies in the range 10 keV $\ensuremath{\le}{E}_{\mathrm{p}}\ensuremath{\le}$ 5 MeV. Both methods, one classical and one semiclassical, combine an independent particle treatment with a multicenter model potential description of the target. The excellent agreement obtained with experimental data supports the usefulness of the approximations involved and encourages the study of more complex systems.
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