Fine structure of V2+ energy levels in CsCaF3:V2+

Theoretical investigations of the fine structure of the lasing 4T2g level in a CsCaF3:V2+ crystal were carried out. The spin–orbit splitting of the 4T2g term in the static low crystal field was obtained from the Eisenstein matrices and using parameters (Dq, B, C, ζSO) appropriate for the 4T2g–4A2g zero-phonon line. The 4T2g spinor splitting has been modeled by the second-order spin–orbit Hamiltonian. The effect of the dynamical Jahn–Teller interaction on the spin–orbit splitting of the 4T2g term was taken into account; the Jahn–Teller stabilization energy, ZPL splitting and the Huang–Rhys parameter for the eg normal mode were all evaluated.