Equilibrium configuration of the self-trapped exciton in CaF2and SrF2
- 10 October 1985
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 18 (28) , L909-L913
- https://doi.org/10.1088/0022-3719/18/28/003
Abstract
The equilibrium configuration of the self-trapped exciton (STE) in CaF2 and SrF2 is calculated by minimising the total energy of the crystal containing an excited electron and a self-trapped hole. The electron is treated by the ion-size method and the lattice by pair potentials. It shows very clearly that the STE in fluorites is not equivalent to a Vk centre plus an electron, but is closer to a F+H pair. It is also shown that only one of the four possible configurations is directly realised after the self-trapped hole captures an electron. The interconversion between the different configurations is briefly discussed.Keywords
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