Electronic and atomic relaxation processes in irradiated cryocrystals

Abstract

Relaxation processes and stability of charge centers in preirradiated cryocrystals doped with atomic and molecular species are discussed. The study was performed combining techniques of spectrally resolved thermally stimulated luminescence (TSL), thermally stimulated exoelectron emission (TSEE) and photonstimulated exoelectron emission (PSEE). Comparison of the yields of electrons and photons in VUV and visible ranges made it possible to discriminate between reactions of charge carriers and neutral reactive species and find interconnection between atomic and electronic processes of relaxation. The radiative mechanism of electronic relaxation stimulation via an atomic subsystem is verified.

Oxygen-driven relaxation processes in pre-irradiated Ar cryocrystals

“…The first results demonstrating reliability of this mechanism are presented in [14]. The experiments on stimulation of relaxation processes by laser light [2,15] provide an additional proof of the mechanisms discussed.…”

“…Very often electronic and atomic relaxation processes occurring in pre-irradiated solids are considered separately ignoring the interconnection between these channels of relaxation. Our recent studies demonstrated the fundamental importance of the interconnection between atomic and electronic processes in the formation and branching of relaxation paths [2].…”

Photo- and thermally stimulated relaxation processes in pre-irradiated atomic solids

“…This reaction is followed by the emission of visible light called by chemiluminescence. This process was considered to be a source of the energy needed for electron detrapping (Savchenko and Bondybey, 2005). So one can expect the sputtering from pre-irradiated RGS induced by photons.…”

On charged impurity structures in liquid helium

“…Electrons can be releazed from the traps by photons of appropriate energy and promoted into the conduction band [51]. Such photomobilized electrons participate in exoelectron emission [51][52][53], react with holes producing luminescence [42,54,55] and anomalous low-temperature post-desorption from the cryocrystal surfaces [45,56].…”