1. High-resolution nonresonant x-ray Raman scattering study on rare earth phosphate nanoparticles.
- Author
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Simo Huotari, Edlira Suljoti, Christoph J Sahle, Stephanie Rädel, Giulio Monaco, and Frank M F de Groot
- Subjects
RARE earth phosphates ,RAMAN scattering ,SEMICONDUCTOR nanoparticles ,LANTHANUM oxide ,TIME-dependent density functional theory ,ELECTRONIC structure ,MAGNETIC dipoles - Abstract
We report high-resolution x-ray Raman scattering studies of high-order multipole spectra of rare earth excitations (the absorption edge) in nanoparticles of the phosphates LaPO
4 , CePO4 , PrPO4 , and NdPO4 . We also present corresponding data for La excitations (the edge) in LaPO4 . The results are compared with those from calculations by atomic multiplet theory and for the dipole contribution to the La transition from a calculation using time-dependent density functional theory (TDLDA). Agreement with the atomic multiplet calculations for the high-order multiplet spectra is remarkable in the case of the spectra. In contrast, we find that the shallow semicore excitations in LaPO4 manifest a relatively broad band and an apparent quenching of spin-orbit splitting. The more sophisticated TDLDA, which has earlier been found to explain dipolar spectra well in Ba compounds, is less satisfactory here in the case of La. [ABSTRACT FROM AUTHOR]- Published
- 2015
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