A quantum-mechanical calculation of the probability of an elementary exoelectron emission (EEE) act from a NaCl crystal is made. The mechanism previously suggested by the authors is used, according to which the emission takes place a t the expense of the energy released a t exoenergetic reactions between defects. The calculations are made for the particular case of annihilation of the F-centre with a negative halide atom. There is good agreement between theory and experimental results. IIonyYeHo xopomee cosnanemie TeOpllH C 3KCIlepLIMeHTaJlbHbIMH pe3yJIbTaTaMH.
A possibility of defect annealing of the alkali halide structure with free exciton formation is discussed and a two-stage exciton model of exoelectron emission (EEE) is suggested. According to this model, within the scope of the mechanism previously proposed by the authors, the defect annihilation results a t the first stage in formation of an exciton which can ionize an electron centre (the second stage of the process). The probability of an elementary act for the NaCl crystal is calculated. The dependence of the exoemission parameters and energy spectra of exoelectrons on the crystal orientation is studied. npouecca). IIposeneH pacseT BepofiTHocTM a n e~e~~a p~o r o a m a nnfi KpMcTanna
Within the frames of a previously suggested mechanism an elementary act of exoelectron emission resulting from annihilation of an F-centre and interstitial negative halogen ion in a NaCl crystal is discussed. The dependence of the EEE parameters on the crystal orientation is studied. Energy spectra and exoemission parameters are obtained for three different crystal orientations. There is good agreement between the theory and experimental results.
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