Abstract
The luminescence of alexandrite excited by a high‐current electron beam is investigated. Its spectrum has bands of the impurity ions Cr3+ and of the Cr–Cr pairs and also the band at λ = 492–495 nm. In all of the crystals we have detected chromium ions distributed over two nonequivalent positions, differently in different crystals. It is shown that the color of the crystals and its change on illumination of the crystals with the light of different spectral composition depend mainly on the chromium ions and their distribution over crystalline positions. A noticeable effect of other impurity ions is noted for a number of crystals.
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