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Visible luminescence of desorbed atoms resulting from the dynamics of self-trapped excitons in neon

I. Ya. Fugol’, A. G. Belov, V. N. Samovarov, V. N. Svishchev, Victor Mikhailovich Zhuravlev

Published Oct 1, 1987• 0 citations
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This paper presents the first results on a correlation between the luminescence of excitons self-trapped at the surface of solid argon and desorption. Recently, Jennison and Emin showed that localisation of electronic excitation at the surface of the crystal is an essential condition, and that especially self-trapping of excitons can lead to desorption of neutral atoms1. In the case of solid argon, self-trapping of excitons at the surface has been proved to exist2. It leads to characteristic luninescence bands which were also measured with electron excitation techniques3. Two of them exactly coincide with the 3P1 and 1P1 emission of isolated argon atoms and were not understood up to now. In the course of this work it turned out that they are emitted by desorbing neutral atoms.
Abstract The luminescence of Ne* centers in solid Ne is investigated. The samples are excited with synchrotron radiation in the excitonic range. By an appropriate selection of the excitation energy and by time correlated measurement of the emission spectra, overlapping luminescence bands are separated and assigned to Ne* centers in different electronic states (1P1, 3P1, 3P2) and different environments in the bulk and at the surface of the solid. Lifetime measurements and excitation spectra of spectrally selected luminescence bands support the assignments, Electronic relaxation from n ≧ 2 free excitons to the n = 1 state is found to be less effective than exciton trapping into Ne* centers. Resonance fluorescence of free Ne* atoms indicates a close connection between exciton trapping and desorption.
We have examined the luminescence from highly excited self-trapped one-center states, the relaxation processes of the band excitations, and the mechanisms of formation of highly excited quasiatomic centers in low-temperature crystals of the light rare gases and their solid solutions. The fundamental channel of population of highly excited emitting centers involves hole self-trapping with formation of two-center R2+ states; dissociative recombination of these forms one-center np5(n + 1)p excitations. We discuss the effect of self-trapping of highly excited states on the population of the lowest emitting centers in neon and argon crystals.