Abstract
An investigation of the low-temperature electronic Raman scattering spectra of ${\mathrm{ErPO}}_{4}$ and ${\mathrm{TmPO}}_{4}$ has been carried out. The experimental intensities have been compared with the standard second-order theory of two-photon processes for both intermultiplet and intramultiplet transitions between individual crystal-field levels. Adequate agreement is found in the case of ${\mathrm{ErPO}}_{4}$, but serious discrepancies exist for ${\mathrm{TmPO}}_{4}$. It is shown that electronic Raman scattering is a sensitive technique for testing the Judd-Ofelt--type theories of two-photon processes in rare-earth crystals. Strong asymmetry, a characteristic feature of electronic Raman scattering, has been observed in several of the transitions.
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