L.V.Kovaleva, L.N.Shpilinskaya, A.M.Kudin,
A.I.Mitichkin, T.A.Charkina
Received July 30, 1998
The presence of BO-2
ions has been found to cause photochemical and radiation-chemical coloration
of CsI(TI) crystals, similarly to the case of roman (CO2-3)
ions; the spectral composition of formed centers is the same in both cases.
The formation mechanism of radiation-induced defects in CsI(TI, BO2)
crystals due to BO-2
ion destruction under F-center formation has been considered.
A model of F-like color centers including thallium ions is discussed. Absorption
bands at 430 and 520 nm are ascribed to transitions in ( Tl+2)
center disturbed by an anionic vacancy while that at 830 nm, by transitions
in F-center disturbed by a (Tl+-Tl+) one.