The F3centre in alkaline earth fluorides. II
- 14 February 1972
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 5 (3) , 266-274
- https://doi.org/10.1088/0022-3719/5/3/004
Abstract
For pt.I see ibid., vol.5, no.3, 257 of 1971. It is suggested that a zero-phonon line in CaF2 at 677.4 nm and in SrF2 at 769.2 nm arises from excitation of an F3 centre composed of three nearest neighbour F centres aligned along (100). Uniaxial stress measurements on the zero-phonon line show that the transition occurs between orbital singlet states in a centre with tetragonal symmetry and that the dipole moment of the transition is parallel to the tetragonal axis of the centre. The zero-phonon lines show a quadratic Stark effect. The model proposed for the centre giving rise to the zero-phonon line is consistent with the experimental results given in the present paper and in the previous paper.Keywords
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