Abstract
The emission from KCl:Ge0 excited in the W range was measured as a function of the exciting photon energy and temperature. The polarized emission spectrum and the angular dependence of polarization ratio were also investigated. Like KCl:Bi3+, KCl:Ge0 single crystals produce two emission bands peaking at 345 and 395 nm. The interstitial Cl- ion is assumed to be responsible for the colour centre of the 345 and 395 nm emissions. The definitive assignment of these bands is presented in terms of the adiabatic potential energy surface, in which the Jahn-Teller effect is taken into account.
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