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- W1966798907 abstract "Abstract An unusually large splitting of the 2 E state of Cr 3+ in kyanite (Al 2 O 3 :SiO 2 ) is reported. To account for the thermal quenching of the R-lines it is necessary to recognize that the two components of the doublet may have remarkably different radiative lifetimes (3400 and 480 μs). These lifetimes were obtained from low temperature decay and from the temperature dependence of the intensity ratio of the two components. These separate lifetimes were then set to fit the temperature dependence of the joint effective lifetime and of the steady state intensities of both lines. At higher temperatures the effect of an unobservable quartet had to be postulated. A reasonable agreement between theory and experiment was achieved assuming that the quartet radiative lifetime was 13 μs and its zero-phonon energy 15570 cm -1 . A simple approach, based on spin-orbit coupling of split 2 E components to 4 T 2 and a one-configuration-coordinate model is an aid to a qualitative understanding of the large difference between the lifetimes of the R-lines, although quantitative agreement between theory and experiment is far from satisfactory." @default.
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- W1966798907 date "1990-05-01" @default.
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- W1966798907 title "Cr3+ in kyanite: A new mechanism of thermally enhanced 2E decay" @default.
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- W1966798907 doi "https://doi.org/10.1016/0022-2313(90)90023-5" @default.
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