A systematic analysis of the spectra of trivalent actinide chlorides in D sub 3h site symmetry
The optical spectra of actinide ions in the compound AnCl{sub 3} and doped into single crystal LaCl{sub 3} were interpreted in terms of transitions within 5f{sup N} configurations. Energy-level calculations were carried out using an effective operator Hamiltonian, the parameters of which were determined by fitting experimental data. Atomic and crystal-field matrices were diagonalized simultaneously assuming an approximate D{sub 3h} site symmetry. The spectroscopic data were taken from the literature but in most cases supplemented by unpublished measurements in absorption and in fluorescence. Spectroscopic data for each ion were analyzed independently, then the model parameters were intercompared and in many cases adjusted such that in the final fitting process the principal interactions showed uniform trends in parameter values with increasing atomic number. Consistent with analyses of the spectra of lanthanide ions in both LaCl{sub 3} and LaF{sub 3}, abrupt changes in magnitude of certain crystal-field parameters were found near the center of the 5f{sup N}-series. This resulted in two groups of parameter values, but with consistent trends for both halves of the series, and generally very good agreement between observed and computed energies. A new energy level chart based on computed crystal-field level energies for each trivalent actinide ion has been prepared. in addition, the parameters of the atomic part of each 5f{sup N} Hamiltonian were used to calculate the matrix elements of U{sup ({lambda})} for selected transitions. The values were tabulated to facilitate calculation of intensity-related parameters for 5f{sup N}-transitions using the Judd-Ofelt theory. 44 refs., 10 figs., 3 tabs.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7017566
- Report Number(s):
- ANL-89/39; ON: DE90008104; TRN: 90-007206
- Country of Publication:
- United States
- Language:
- English
Similar Records
A systematic analysis of the spectra of the lanthanides doped into single crystal LaF/sub 3/
Systematic analysis of the spectra of the lanthanides doped into single crystal LaF/sub 3/
Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACTINIUM CHLORIDES
ENERGY LEVELS
ACTINIDES
CALCULATION METHODS
CRYSTAL STRUCTURE
ENERGY SPECTRA
HAMILTONIANS
MATRIX ELEMENTS
ACTINIDE COMPOUNDS
ACTINIUM COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
MATHEMATICAL OPERATORS
METALS
QUANTUM OPERATORS
SPECTRA
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
400102 - Chemical & Spectral Procedures