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We have modeled the 4f1-5d1 absorption spectrum of a LiYF4:Ce3+ crystal at zero temperature using a microscopic model of the electron-phonon interaction and the real spectrum of LiYF4 lattice vibrations. Effects caused by mixing of the wave functions of different states of the 5d1 excited configuration of the Ce3+ ion, which is induced by the electron-phonon interaction, are considered based on...
Based on a microscopic model of the electron-phonon interaction, we have calculated the shape of the 4f135d-4f14 electronic-vibrational luminescence spectrum of a LiYF4:Lu3+ crystal at zero temperature taking into account the quadratic non-Condon effect. We have found that the magnitude of the quadratic non-Condon effect of this spectrum is several times greater than the magnitude of the linear...
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