| Autor: |
Simo Huotari, Edlira Suljoti, Christoph J Sahle, Stephanie Rädel, Giulio Monaco, Frank M F de Groot |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 17, Iss 4, p 043041 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/17/4/043041 |
| Popis: |
We report high-resolution x-ray Raman scattering studies of high-order multipole spectra of rare earth $4d\to 4f$ excitations (the ${{N}_{4,5}}$ absorption edge) in nanoparticles of the phosphates LaPO _4 , CePO _4 , PrPO _4 , and NdPO _4 . We also present corresponding data for La $5p\to 5d$ excitations (the ${{O}_{2,3}}$ edge) in LaPO _4 . The results are compared with those from calculations by atomic multiplet theory and for the dipole contribution to the La $4d\to 4f$ 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 ${{N}_{4,5}}$ spectra. In contrast, we find that the shallow ${{O}_{2,3}}$ semicore excitations in LaPO _4 manifest a relatively broad band and an apparent quenching of $5p$ 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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
