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- W1619429748 abstract "Laser-selective excitation and optical-absorption techniques have been used to establish comprehensive sets of energy levels for both the ${mathit{F}}^{mathrm{ensuremath{-}}}$ and hydrogenic varieties of the tetragonal symmetry (${mathit{C}}_{4mathit{v}}$) centers in ${mathrm{SrF}}_{2}$ and ${mathrm{CaF}}_{2}$. Polarization of the various spectral lines was used to determine the symmetry labels of many of the energy levels. Reversals of the ordering of some levels between ${mathrm{SrF}}_{2}$ and ${mathrm{CaF}}_{2}$ are found and, in particular, the two lowest levels (${mathit{D}}_{1}$ and ${mathit{D}}_{2}$) of the $^{1}$${mathit{D}}_{2}$ multiplet, which are the originating levels for many of the observed emission transitions, have reversed-symmetry label assignments in ${mathrm{SrF}}_{2}$ and ${mathrm{CaF}}_{2}$. Differences were found between the ground-state Zeeman splittings for the ${mathit{C}}_{4mathit{v}}$ ${mathit{F}}^{mathrm{ensuremath{-}}}$ and ${mathit{D}}^{mathrm{ensuremath{-}}}$ centers for both ${mathrm{SrF}}_{2}$ and ${mathrm{CaF}}_{2}$. Fluorescence lifetimes of the ${mathit{C}}_{4mathit{v}}$ hydrogenic centers show a strong dependence on the particular charge-compensating ion present through nonradiative decay processes involving the respective local mode phonons. The upconversion spectra observed for ${mathit{F}}^{mathrm{ensuremath{-}}}$, ${mathit{T}}^{mathrm{ensuremath{-}}}$, and ${mathit{D}}^{mathrm{ensuremath{-}}}$ varieties of the ${mathit{C}}_{4mathit{v}}$ centers in ${mathrm{SrF}}_{2}$ and for the ${mathit{C}}_{4mathit{v}}$ ${mathit{F}}^{mathrm{ensuremath{-}}}$ center in ${mathrm{CaF}}_{2}$ are all consistent with excitation of specific subsets of nearby ${mathit{C}}_{4mathit{v}}$ centers." @default.
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- W1619429748 title "Site-selective laser spectroscopy of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant=normal>Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=italic>C</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mi mathvariant=italic>v</mml:…" @default.
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