Abstract
We carried out a combined study of UV–VUV luminescence and resonant x-ray emissionfrom BeO single crystals with incident photon energies in the vicinity of the Be 1sabsorption edge. The x-ray emission spectra show that at the Be 1s photoabsorption edgethe lattice relaxation processes in the excitation site take place already on the timescale ofthe radiative decay of the core excitation. Comparison of the x-ray emission andthe luminescence spectra indicates that the maximum energy loss of the processof lattice relaxation during the decay of inner-shell holes is similar to the lossthat occurs in the self-trapping process of valence excitons. The possible decaychannels of core excitations have been discussed and the mechanism for the creationof 5.2 eV luminescence at the photoabsorption resonances has been suggested.
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