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The first energy- and angle-resolved measurements are presented for ground and excited state atoms ejected from a single crystal metal surface due to keV ion bombardment. These results show that at high velocities the ratio of the excited state to ground state intensity varies as exp(−A/av⊥) but at lower velocities the ratio is almost independent of velocity. We use a collisional excitation model to show conclusively that the details of the atomic motions are necessary to explain the experimental data.
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Winograd et al. (1992) studied this question.
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