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- W2015969910 abstract "Abstract An investigation is made of the spectral dependence of the luminescence quantum yield ratio (η/η 0 ) of coloured and non‐coloured ruby and of the yield (η add ) calculated for additional absorption. It is shown that in the additional absorption (Δ k ) are bands of different nature. Those with η add = 0 are called “active”, the others, with η add = 0, are called “inactive”. The active absorption connected with an electron transition to the conduction band and a following recombination with R‐line radiation, is attributed to Cr 2+ ions, the inactive to Cr 4 + ions. Experiments of monochromatic light action on coloured ruby have confirmed this conclusion; light absorbed in the region of active bands bleaches the crystal, whereas bleaching does not occur in the region of inactive bands. The results obtained allow to suggest a level scheme of corundum with a Cr 2+ centre." @default.
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- W2015969910 date "1968-01-01" @default.
- W2015969910 modified "2023-09-29" @default.
- W2015969910 title "On the Nature of the Colour Centres of Ruby" @default.
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- W2015969910 doi "https://doi.org/10.1002/pssb.19680290235" @default.
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