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Spectroscopic analysis demonstrates anomalous transitions and polarization anisotropy in Cr3+:K2NaScF6 crystals, indicating breakdowns in standard optical transition approximations.
Two-photon excitation (TPE) spectra of Cr3+:K2NaScF6 exhibit unexpected features including a forbidden transition, extended progressions, a split zero-phonon line and anomalous polarization anisotropy. These features are explained by departures from standard approximations.
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Bartram et al. (2001) studied this question.
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