RECOMBINATION LUMINESCENCE OF RARE-GAS CRYSTALS

The mechanism of the recombination luminescence in single rare gas cry stals (Ar, Kr, Xe) has been studied experimentally. The detailed dose dependencies of the stationary X-ray luminescence of the crystals and the main specific features of their thermoluminescence have been ascer tained. Essentially different nature of the hole trapping processes in different rare gas crystals has been demonstrated. A simple model inv olving several independent assemblies of correlated electron-hole trap s has been proposed to explain the experimental thermoluminescence dat a. In addition to the main well-known exciton bands, several weaker ba nds at lower energies, increasing in intensity as a result of irradiat ion, have been indicated for pure rare gas crystals. Surprising simila rity between the additional UV emission in solids and the so-called th ird rare gas continua has been found and discussed.