We investigate the excitation energy dependence of the boron K soft-x-ray emission of B₂{O}₃$ and hexagonal-BN using synchrotron radiation. When exciting into the core exciton state the spectra are shifted to lower energy by 1.5 and 1.8 eV, respectively. This shift is found to be a result of phonon relaxation and differences in initial-and final-state electronic screening.
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O’Brien et al. (1993) studied this question.
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