Abstract
The cathodoluminescence of localized electronic states (L intrinsic centers) in glasses of the composition (mol %) 22Me 2O · 3CaO · 75SiO2 and Me 2O · 3SiO2 (Me = Li, Na, K) is investigated upon excitation with a pulsed electron beam (180 keV, 700 A/cm2, 2 ns). The luminescence spectra recorded in a pulsed periodic mode contain bands of L centers of two types whose occurrence reflects the formation of fragments with different degrees of atomic ordering in the microstructure of glasses. The line spectra with separations between the lines ν0 = 820 cm-1 and ν1 = 520-640 cm-1 are measured in a single-pulse mode. The effect revealed is attributed to the manifestation of the vibronic interactions during radiative relaxation of the triplet state of L centers. It is demonstrated that, according to the mechanism of cathodoluminescence, electronic excitations interact with local vibrations of nonbridging oxygen atoms and phonon modes of the glass network. The corresponding interactions are classified as vibronic(ν0) and electron-phonon (ν1) interactions.
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