Structure of the short-lived absorption and luminescence spectra of barium and calcium fluorides accompanying pulsed electron irradiation

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Abstract

It is established that the optical absorption in the hole and electron components of autolocalized excitons in BaF 2 excited by a pulsed electron beam consists of a collection of overlapping bands with a half-width no greater than 0.1 eV. Simultaneous subexcitation with the stimulated emission of II-VI semiconductors made it possible to isolate three groups of bands, caused, by analogy with CaF 2 [Phys. Solid State 39, 1060 (1997)], by different configurations of autolocalized excitons in the fluorite lattice. The process of radiative decay of autolocalized excitons in CaF 2 and BaF 2 when they are optically excited in the region of the electron component of the absorption has been detected. The spectral rate parameters of the radiation that appears during simultaneous subexcitation coincide with the characteristics of the radiation ascribed earlier to core-valence transitions. The photostimulated variation of the absorption spectra of autolocalized excitons is accompanied by selective variation of the luminescence spectra of autolocalized excitons, which also is evidence of their complex spectral content.

Original languageEnglish
Pages (from-to)837-838
Number of pages2
JournalTechnical Physics Letters
Volume23
Issue number11
Publication statusPublished - Nov 1997

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barium fluorides
calcium fluorides
electron irradiation
excitons
luminescence
absorption spectra
fluorite
radiation
stimulated emission
optical absorption
electrons
electron beams
solid state
valence
decay
configurations

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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title = "Structure of the short-lived absorption and luminescence spectra of barium and calcium fluorides accompanying pulsed electron irradiation",
abstract = "It is established that the optical absorption in the hole and electron components of autolocalized excitons in BaF 2 excited by a pulsed electron beam consists of a collection of overlapping bands with a half-width no greater than 0.1 eV. Simultaneous subexcitation with the stimulated emission of II-VI semiconductors made it possible to isolate three groups of bands, caused, by analogy with CaF 2 [Phys. Solid State 39, 1060 (1997)], by different configurations of autolocalized excitons in the fluorite lattice. The process of radiative decay of autolocalized excitons in CaF 2 and BaF 2 when they are optically excited in the region of the electron component of the absorption has been detected. The spectral rate parameters of the radiation that appears during simultaneous subexcitation coincide with the characteristics of the radiation ascribed earlier to core-valence transitions. The photostimulated variation of the absorption spectra of autolocalized excitons is accompanied by selective variation of the luminescence spectra of autolocalized excitons, which also is evidence of their complex spectral content.",
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T1 - Structure of the short-lived absorption and luminescence spectra of barium and calcium fluorides accompanying pulsed electron irradiation

AU - Shtan'ko, V. F.

AU - Chinkov, E. P.

PY - 1997/11

Y1 - 1997/11

N2 - It is established that the optical absorption in the hole and electron components of autolocalized excitons in BaF 2 excited by a pulsed electron beam consists of a collection of overlapping bands with a half-width no greater than 0.1 eV. Simultaneous subexcitation with the stimulated emission of II-VI semiconductors made it possible to isolate three groups of bands, caused, by analogy with CaF 2 [Phys. Solid State 39, 1060 (1997)], by different configurations of autolocalized excitons in the fluorite lattice. The process of radiative decay of autolocalized excitons in CaF 2 and BaF 2 when they are optically excited in the region of the electron component of the absorption has been detected. The spectral rate parameters of the radiation that appears during simultaneous subexcitation coincide with the characteristics of the radiation ascribed earlier to core-valence transitions. The photostimulated variation of the absorption spectra of autolocalized excitons is accompanied by selective variation of the luminescence spectra of autolocalized excitons, which also is evidence of their complex spectral content.

AB - It is established that the optical absorption in the hole and electron components of autolocalized excitons in BaF 2 excited by a pulsed electron beam consists of a collection of overlapping bands with a half-width no greater than 0.1 eV. Simultaneous subexcitation with the stimulated emission of II-VI semiconductors made it possible to isolate three groups of bands, caused, by analogy with CaF 2 [Phys. Solid State 39, 1060 (1997)], by different configurations of autolocalized excitons in the fluorite lattice. The process of radiative decay of autolocalized excitons in CaF 2 and BaF 2 when they are optically excited in the region of the electron component of the absorption has been detected. The spectral rate parameters of the radiation that appears during simultaneous subexcitation coincide with the characteristics of the radiation ascribed earlier to core-valence transitions. The photostimulated variation of the absorption spectra of autolocalized excitons is accompanied by selective variation of the luminescence spectra of autolocalized excitons, which also is evidence of their complex spectral content.

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