The creation of triplets of spatially correlated defects (F center + self-trapped hole, VK center + interstitial halogen ion, I center) was studied at 8K by using synchrotron radiation (6 to 25eV) and highly sensitive luminescent methods. Spatially correlated F and H center creation by synchrotron radiation at 8K was also measured. The efficiency of F-νκ-I triplet creation was especially high after irradiation with photons under conditions of multiplication of electronic excitation where the absorption of one photon led to the formation of an electron-hole pair and a secondary exciton (15.0 to 16.5eV), or 2 electron-hole pairs (16.7 to 19.0eV), or to the formation of a 3p5s cation exciton (19.5 to 20.5eV). It was shown that the formation of an F-νκ-I triplet was caused by the re-charging of a primary F-H pair by an electron-hole pair or by a free exciton.

Creation of Groups of Spatially Correlated Defects in a KBr Crystal at 8K. M.Kirm, A.Lushchik, C.Lushchik, I.Martinson, V.Nagirnyi, E.Vasilchenko: Journal of Physics - Condensed Matter, 1998, 10[16], 3509-21