Superelastic electron scattering by laser-excited sodium atoms has been measured to determine alignment and orientation parameters for total energies of 12.1 and 22.1 eV, at scattering angles from 5 to 110'. The results allow critical comparison with previous experimental data obtained using both coincidence and superelastic methods, including spin-resolved measurements, and with available theoretical models. Close coupling methods are found particularly promising, although further development is required.
A b s t n d . A modulated crossed beam technique has been used to measure the differential cross sections for the excitation of the 3'P state in magnesium by elecvons at impact energies of 10 and 20 eV. The cross sections ace measured over a range of scattering angles fmm IO to 130'.Our results agree with the previous exprimental cross sections of Williams and Trajmar within the combined uncertainties. however the present data reduce the uncenainty by almost an order of magnitude thereby allowing a meaningful comparison to be made with the predictions of the various theories. At this time no theory accurately predicts the behaviour of the cmss sections over the whole angular range.
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