Abstract
The quenching effects in energy differences and EPR spectrum of the three lower-lying spin-orbit levels E3/2, 1E1/2 and 2E1/2 of 3T2g ground term of 3 d1 V4+ in α-Al2O3 have been calculated by using high-order perturbation formulae. These formulae are derived by T2⊗e dynamic Jahn-Teller model and the contributions from 2Eg term are also taken into account. The experimental results are explained plausibly and the Ham deduction factor, phonon energy and crystal field parameters are estimated. The results show that the second-order contributions are important to explain quenching phenomena of optical properties and EPR spectrum.
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