We have measured electron-stimulated desorption of neutral lithium atoms from LiF at energies near the band gap of the crystal. The significant contribution to the desorption yield of neutral alkali-metal atoms due to the creation of surface excitons is resolved. These measurements also prove the theoretically expected threshold for desorption at the energy of the bulk exciton.
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Wurz et al. (1991) studied this question.
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