We have measured large orientations for Ar II states excited by 300-keV Ar⁺ impact on solid Cu surfaces at grazing incidence. We report circulary polarized light fractions of up to 76% and interpret the excitation mechanism as an orbital-angular-momentum effect. As an application of this new excitation scheme, a zero-field level-crossing experiment is presented.
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Andrä et al. (1976) studied this question.
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