Temperature dependence of the polarisation of the emission of the Ga+centre in alkali halides
- 10 June 1980
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 13 (16) , 3057-3069
- https://doi.org/10.1088/0022-3719/13/16/013
Abstract
The temperature dependence of the linear polarisation of the AT emission of a Ga+ centre is studied in NaCl, KCl, KBr and KI. A strong reduction of the polarisation in KCl and KBr between 1.6 and 10K is attributed to relaxation inside the Jahn-Teller wells and to transitions between the orthorhombic wells associated with a main Jahn-Teller tetragonal distortion with an activation energy of 30-40K. The existence of a plateau at higher temperature shows that transitions to trigonal Jahn-Teller wells take place before the transitions between the main tetragonal Jahn-Teller wells become effective.Keywords
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