M centres in alkaline earth fluorides

Author:

Abstract

We have investigated the origins of the α and β bands in additively coloured CaF 2 , which were described by Mollwo (1934). We have shown that the α band is a superposition of bands arising from the F centre, the M centre and higher F aggregate centres and that the β band is the analogue of the M band in the alkali halides. To avoid confusion with the α and β bands in the alkali halides, which have an excitonic origin, we rename Mollwo’s α and β bands the S and M bands. The M centre in CaF 2 consists of two nearest neighbour F centres and hence is alined along <100>. The structure of the M centre was determined through the anisotropy of its optical absorption and fluorescence. The lifetime of the M centre fluo­rescence has been measured. The thermal orientation of the M centre in its ground state has been investigated. The optical absorption of the M centre in SrF 2 and BaF 2 has also been investigated.

Publisher

The Royal Society

Subject

Pharmacology (medical)

Reference21 articles.

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