High-pressure spectroscopic studies of free and self-trapped excitons in alkali halides at low temperatures |
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Authors: | A. Laisaar V. Shcherbakov A. Kuznetsov |
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Affiliation: | Institute of Physics, Estonian Academy of Sciences , Riia 142, 202400, Tartu , USSR |
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Abstract: | Abstract A brief survey of our studies of free and self-trapped excitons (FE and STE) in alkali halide crystals under hydrostatic pressure up to 12.5 kbar at 4.2–140 K is presented. Main attention is paid to the following effects observed: (1) the strong coupling of three energy levels of FE in CsI revealing itself as an exciton analog of pressure-scanned Fermi resonance; (2) emergence of a new emission band of STE in CsI under pressure; (3) a large pressure shift of the thermal quenching curve for STE emission in NaCl. |
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Keywords: | High pressures low temperatures free and self-trapped excitons optical spectra alkali halide crystals |
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