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- W2006277957 abstract "The population ratio $frac{{N}_{ensuremath{-}}}{{N}_{+}}$ of the Zeeman states of $overline{E}(^{2}E)$ has been measured over five decades of metastable-state concentrations ${N}_{ensuremath{-}}$ in 2500-ppm ruby at 28 kG and 1.5 K, i.e., in the absence of thermalization between ${overline{E}}_{ifmmodepmelsetextpmfi{}}$. Upon raising the pumping, $frac{{N}_{ensuremath{-}}}{{N}_{+}}$ falls below the value corresponding to optical feeding only due to optically induced two-phonon processes via $2overline{A}(^{2}E)$. Rate equations account for the findings under the assumption of marginal (ballistic regime) or moderate (spatially diffusive regime) trapping of these 29-${mathrm{cm}}^{ensuremath{-}1}$ phonons. At high pumping, $frac{{N}_{ensuremath{-}}}{{N}_{+}}$ further drops to unity, reflecting disturbance of the Boltzmann equilibrium within the $^{4}A_{2}$ ground state." @default.
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- W2006277957 date "1979-11-01" @default.
- W2006277957 modified "2023-09-26" @default.
- W2006277957 title "Optically induced two-phonon processes connecting theE¯(E2)states in ruby" @default.
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- W2006277957 doi "https://doi.org/10.1103/physrevb.20.3615" @default.
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