Correlation of thermoluminescence and optical absorption of Z3 centers in LiF:Mg, Ti crystals

In order to clear the trap structure of the so-called TL peak 6 in thermoluminescent magnesium and titanium doped lithium fluoride, an appropriate irradiation and post-annealing treatment is used. The comparison of the TL and optical measurements shows with increasing dose an increase at the same rate of the height of TL peak 6 and the absorption band at E = 5.5 eV. Because this band is due to Z3 centers (Mg2+-F pairs), it is deduced that the same centers are responsible for TL peak 6. The result of the investigations is in agreement with a recently published model for the trapping process in LiF.