Abstract
The excitation spectra of the light lanthanides and incorporated in and are investigated in the ultraviolet and vacuum-ultraviolet spectral region (100–250 nm). In these host lattices fine structure (zero-phonon lines and vibronic lines) is observed for fd transitions involving the lowest crystal-field state. The observation of zero-phonon lines makes it possible to analyze the complicated structure in the fd spectra and to compare the experimentally observed spectra with energy-level calculations for the states. Energy-level and intensity calculations were performed by an extension of the commonly used theory for energy-level calculations of states. A good agreement between experiment and theory is obtained for the overall structure using the crystal-field splitting (from the spectra of the parameters for the splitting of the core (from the literature on energy level calculations for states) and the spin-orbit coupling of the electron and Coulomb interaction between and electrons (from atomic parameters using the computer code of Cowan).
- Received 13 November 2000
DOI:https://doi.org/10.1103/PhysRevB.65.045113
©2002 American Physical Society