Not only (Ag-)(2) and Ag-(Na+) centres but also various Ag--Na+ aggregate c
entres have been produced in Ag+-,Na+- and Ca2+-codoped KCl crystals by unu
sual electrolytic colouration such as colouration at a relatively low tempe
rature of 280 degreesC and a high electric field of 5000 V/cm. Absorption a
nd magnetic circular dichroism spectra due to these centres have been inves
tigated. (C) 2001 Elsevier Science B.V. All rights reserved.