Abstract
Angular dependencies of the EPR spectra detected via the magnetic circular dichroism of the optical absorption (MCDA-EPR) observed in the MCDA bands at 355, 411, 425, 442, 465, 536, and 815nm of γ- or X-irradiated CsI:Tl crystals have been investigated. The MCDA-EPR spectrum at B || [100] consists of two quartets of intense lines. The spectrum could be satisfactorily explained taking into account hyperfine (hf) interactions of unpaired electron with S=12 with three Tl nuclei I (205Tl, 203Tl)=12. Therefore we propose as a model a Tl-trimer centre. The hf interactions along a [100] direction with two equivalent Tl and one single Tl were observed. As a centre model we propose TlCs++–Tli0–TlCs++. The Tl hf interactions observed can be explained qualitatively in a ionic model for this trimer centre.
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