Barabashov A. Electron-stimulated processes in solid nitrogen

The dissertation presents the experimental study of electron-stimulated processes in solid nitrogen. The desorption of excited molecules and atoms from the surface of solid nitrogen was detected for the first time and the information on the electronic states of desorbing particles was obtained. It was found that the molecules leave the sample in the C3Πu state, while the atoms leave the sample in the 4P state. The mechanism of excited molecules desorption was determined - dissociative recombination of autolocalized holes. Two possible channels of excited atoms desorption are presented - dissociative recombination of N3+ centers with electrons and recombination of N+ ions formed by excitation of internal shells. Significant contribution of charge recombination in electronically stimulated desorption was revealed. New data on the space distribution of charge centers in pre-irradiated solid nitrogen films were obtained. It was found that the highest concentration of self-localized (N4+) and localized (N3+) holes is achieved in the layers close to the sample-substrate interface. Data on the unidentified 360 nm band were obtained. The N4+ neutralization scenario with the help of the so-called "cage effect" was proposed and the formation of a neutral cluster N4 as the center responsible for the emission near 360 nm.