Abstract
The lattice relaxation dynamics in the creation of the C 1 s core exciton in diamond is investigated theoretically by calculating the X-ray absorption and resonant X-ray emission spectra. The excited C atom relaxes to a new equilibrium position lying in the [111] direction as a result of the strong exciton-phonon coupling. Due to the relatively short lifetime of the core excited state, this off-center displacement is exhibited as the hot luminescence in the resonant X-ray emission spectrum. Spectral features experimentally obtained by Ma et al. are qualitatively well reproduced.
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