Vacuum-ultraviolet absorption bands of trivalent lanthanides in La
- 1 January 1976
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 13 (1), 94-104
- https://doi.org/10.1103/physrevb.13.94
Abstract
The ultraviolet absorption bands of trivalent rare earths in La are located by the use of absorption and selective excitation spectra. These absorptions are quite strong arising from the electric dipole transition, which promotes a electron from the rare-earth shell to the or some higher-lying orbital. The onsets of the absorptions range from about 40 000 for cerium to beyond 80 000 for lutetium showing a general increase from cerium to gadolinium, a sudden drop from gadolinium to terbium, and another increase. The positions of the bands are compared with estimates by several workers of the level position for trivalent free ions. In general the La crystal field lowers and broadens the level with respect to its freeion counterpart. For the simplest rare earth, cerium, the splitting caused by the La crystal field is calculated using a point-charge model. Agreement with experiment is poor, so a two-parameter fit to the splitting is made which indicates that the point-charge model plus the approximation for the radial integrals involved overestimate the crystal-field perturbation on the electron by roughly a factor of 3.
Keywords
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