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- W56335054 abstract "The absorption of single photons by coupled pairs of ions in rare-earth solids was first observed by Varsanyi and Dieke.1 They noticed that weak absorption of light occurred in PrCl3 at frequencies close to the sum of transition frequencies of individual Pr ions, giving rise to rare-earth fluorescence. This effect was explained by the perturbation theory of Dexter.2 He showed that weak multipole or exchange interactions between rare-earth ions permitted the simultaneous promotion of two ions to excited states by the action of one absorbed photon in an electric dipole allowed transition. Similarly, two ions initially in excited states could emit one sum frequency photon in a cooperative manner." @default.
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- W56335054 date "1987-04-26" @default.
- W56335054 modified "2023-09-22" @default.
- W56335054 title "Modified dipole–dipole interactions on optically excited pair transitions" @default.
- W56335054 hasPublicationYear "1987" @default.
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