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- W2023994377 abstract "Two-photon absorption linewidths of $^{8}mathrm{S}_{7/2}$${ensuremath{rightarrow}}^{6}$${mathrm{P}}_{7/2}$ transitions in ${mathrm{Eu}}^{2+}$-doped ${mathrm{CaF}}_{2}$ are studied as a function of the temperature. Linewidths are shown to have a linear dependence on the occupation number of LO phonons (${n}_{mathrm{LO}}$) of the ${mathrm{CaF}}_{2}$ lattice. This result is explained by means of the different polarizabilities of the ground and the excited states, which give rise to elastic phonon scattering. By using the polarizability of ${mathrm{Eu}}^{2+}$ in ${mathrm{EuF}}_{2}$ we predict a slope for the linewidth ensuremath{Gamma}(T) versus ${n}_{mathrm{LO}(mathrm{T}}$) curve, which is in fairly good agreement with the experimental data. The linewidth at T close to zero is ascribed to inelastic phonon scattering which causes the 4${f}^{7}$-4${f}^{6}$5d configuration mixing. The theory also predicts a line shift proportional to the occupation number." @default.
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- W2023994377 date "1988-04-15" @default.
- W2023994377 modified "2023-09-27" @default.
- W2023994377 title "Temperature dependence of two-photon absorption linewidths ofEu2+inCaF2" @default.
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- W2023994377 doi "https://doi.org/10.1103/physrevb.37.7058" @default.
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