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Solid State Communications

Structured emission of relaxing systems: molecular excitons in rare-gas crystals

R. Englman, Anedio Ranfagni, Daniela Mugnai

Published Mar 1, 1982• 4 citations
Publisher
DOI
10.1016/0038-1098(82)91244-3

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Self Trapping of Excitons at the Surface of Rare Gas Solids and its Manifestation in Luminescence and Desorption

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International Conference on Luminescence - 1984•Jan 1, 1984•0 citations
To understand the optical properties of atoms in solid state matrices, the absorption, excitation, and emission spectra of rubidium doped thin-films of argon, krypton, and xenon were investigated in detail. A two-dimensional spectral analysis extends earlier reports on the excitation and emission properties of rubidium in rare-gas hosts. We found that the doped crystals of krypton and xenon exhibit a simple absorption-emission relation, whereas rubidium in argon showed more complicated spectral structures. Our sample preparation employed in the present work yielded different results for the Ar crystal, but our peak positions were consistent with the prediction based on the linear extrapolation of Xe and Kr data. We also observed a bleaching behavior in rubidium excitation spectra, which suggests a population transfer from one to another spectral feature due to hole-burning. The observed optical response implies that rubidium in rare-gas thin-films is detectable with extremely high sensitivity, possibly down to a single atom level, in low concentration samples.
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.