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- W2000739089 abstract "Luminescence is reported from the ${}^{2}{mathrm{I}}_{11/2}$ level of ${mathrm{Er}}^{3+},$ in the cubic elpasolite lattices ${mathrm{Cs}}_{2}{mathrm{NaErCl}}_{6}$ and ${mathrm{Cs}}_{2}{mathrm{NaYCl}}_{6}.$ Altogether, with the use of ultraviolet laser excitation, 11 transitions from ${}^{2}{mathrm{I}}_{11/2}$ ${ensuremath{Gamma}}_{7}$ (at 40 668 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) to lower term multiplets have been observed and assigned. Transitions are also reported from the ${}^{2}{mathrm{K}}_{13/2}$ ${ensuremath{Gamma}}_{6}$ level at 32 613 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$. The absence of emission from ${}^{2}{mathrm{P}}_{3/2}$ (at 31 367 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) under the experimental conditions is rationalized. Up-conversion to ${}^{2}mathrm{H}{(2)}_{9/2},$ which is not due to two-photon absorption, is reported for ${mathrm{Cs}}_{2}{mathrm{NaErCl}}_{6}$ under blue pulsed laser excitation. Trap emission from ${}^{2}{mathrm{G}}_{9/2}$ defect sites has been observed under ultraviolet excitation. A preliminary investigation has been made of the electronic absorption spectra of ${mathrm{Cs}}_{2}{mathrm{NaErCl}}_{6}$ and 58 Kramers quartet and doublet levels have been assigned, with a further 18 levels uncertain. The energy-level fit to 58 levels with total degeneracy 180 has been performed with a mean deviation of 20.4 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, which is improved to 16.8 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ if an empirical correction to the diagonal reduced matrix element of ${mathrm{U}}^{4}$ for ${mathrm{the}}^{2}$H(2) term is included. The average error is similar for the 18 uncertain levels (total degeneracy 52). A comparison is included with the energy-level parametrizations of other ${mathrm{Er}}^{3+}$ systems." @default.
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- W2000739089 date "2002-10-03" @default.
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- W2000739089 title "Ultravioletf→femission and crystal field analysis forEr3+inCs2NaErCl6" @default.
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- W2000739089 doi "https://doi.org/10.1103/physrevb.66.165203" @default.
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