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- W112319107 abstract "It was first shown by Axe and Sorokin that nonradiative decay of the terminal optical maser level ($^{7}F_{1}$) Ca${mathrm{F}}_{2}$: ${mathrm{Sm}}^{2+}$ is forbidden to first order even though many phonon states are available with the proper energy for the transition. At first sight this would indicate the $^{7}F_{1}$ level to be metastable. It is shown that a second-order two-phonon emission transition can alleviate this bottleneck, and the decay process rate is computed. This process, involving virtual transitions to a higher level ($^{7}F_{2}$), is shown to be very effective and to lead to a nonradiative lifetime of ensuremath{sim}${10}^{ensuremath{-}6}$ sec, in accord with the necessary conditions for the existence of optical maser action in Ca${mathrm{F}}_{2}$: ${mathrm{Sm}}^{2+}$." @default.
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- W112319107 date "1964-01-06" @default.
- W112319107 modified "2023-09-23" @default.
- W112319107 title "Second-Order Nonradiative Processes in CaF2:Sm2+" @default.
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- W112319107 doi "https://doi.org/10.1103/physrev.133.a34" @default.
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