Colour Centres in Alkali Metal Doped SrF 2 | Zendy

Hamaïdia A. | Zendy

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Colour Centres in Alkali Metal Doped SrF 2

Author(s) -

Hamaïdia A.

Publication year - 1988

Publication title -

physica status solidi (b)

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.51

H-Index - 109

eISSN - 1521-3951

pISSN - 0370-1972

DOI - 10.1002/pssb.2221500136

Subject(s) - paramagnetism , alkali metal , electron paramagnetic resonance , magnetic circular dichroism , wavelength , doping , spectral line , chemistry , spectroscopy , nuclear magnetic resonance , crystallography , materials science , physics , optics , condensed matter physics , organic chemistry , quantum mechanics , astronomy

Colour centres in SrF 2 :Na + and SrF 2 :K + are studied by optical spectroscopy, magnetic circular dichroism (MCD) and by EPR. It is shown that, in each of these two materials, there exist two kinds of F A centres, the weakly perturbed F A (1)and the more strongly perturbed F A (2) . The improperly named F 2A centre is paramagnetic and its MCD has no similarity at all with the one of the F 2 centre in SrF 2 . In SrF 2 :A + , non paramagnetic colour centres of the “F 3A + “ type are observed, as in CaF 2 :A + , but no defect corresponding to the f centre of CaF 2 :Na + . On the other hand, in SrF 2 :Na + can be produced a centre which is called c', comparable to “F 3A + “, but with a spectral shift toward shorter wavelengths.

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