We report measurements of the energy and angular distributions of positive ions (principally Mg⁺) photodesorbed from polished MgO crystals exposed to 248 nm excimer laser radiation. At low laser fluences, kinetic energies of several eV are observed and angular distributions are highly peaked in the direction perpendicular to the surface. We present an electrostatic model involving Coulombic repulsion of positively charged ions repelled by photoionized F centers.
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Dickinson et al. (1994) studied this question.
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