Room-temperature absorption and luminescence spectra of the R-1 and R-2 bands in a single crystal of Ruby Al2O3:Cr3+ (0.05) are analyzed. The luminescence in these bands was induced both by crystal excitation by radiation of a halogen lamp and by selective excitation of two upper levels of the T-2(1) state by radiation of a tunable laser diode (656-662 nm). Four different shifts of the R-1 and R-2 bands and four different distances between these bands the change in which is a multiple of similar to 0.52 cm(-1) are discovered in spectra of se-lectively excited luminescence bands. Detailed comparative analysis of the obtained spectral bands of luminescence and corresponding absorption spectra allowed determining combined structure of each of the R-1 and R-2 bands formed by satellite doublets of these bands associated with all four stable isotopes Cr-50(3+), Cr-52(3+), Cr-53(3+), and Cr-54(3-) of chromium ions. Splitting of these doublets varies from 7.04 to 9.14 cm(-1) depending on the isotope mass.
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