Analysis of the crystal-field spectra of the actinide tetrafluorides. II. AmF[sub 4], CmF[sub 4], Cm[sup 4+]:CeF[sub 4], and Bk[sup 4+]:CeF[sub 4]
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We report a systematic analysis of the crystal-field spectra of four fluoride compounds containing tetravalent actinide ions. The first part of this work [J. Chem. Phys. [bold 95], 7194 (1991)] provided interpretation of the absorption spectra of UF[sub 4], NpF[sub 4], and PuF[sub 4]. To extend our analysis to heavier elements of the series, low-temperature absorption spectra of AmF[sub 4] and CmF[sub 4], and site selective laser-induced emission and excitation spectra of Cm[sup 4+]:CeF[sub 4] and Bk[sup 4+]:CeF[sub 4] were obtained. A model energy level calculation was found to be in good agreement with the experimental results. It is shown that the crystal-field interaction in combination with spin--orbital coupling results in significant [ital J] mixing in the excited states, but ground state wave functions are still relatively pure in [ital J] character for the tetravalent actinide ions Am[sup 4+], Cm[sup 4+], and Bk[sup 4+]. Trends in the parameters of the effective operator Hamiltonian are compared with those of a Hartree--Fock free-ion model. Interpretation of the ground-state splitting of the nominal [ital S]-state ion Bk[sup 4+] in CeF[sub 4] and color center formation in AmF[sub 4] are also discussed.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6841563
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 101:10; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360606* -- Other Materials-- Physical Properties-- (1992-)
ACTINIDE COMPOUNDS
AMERICIUM COMPOUNDS
AMERICIUM FLUORIDES
BERKELIUM IONS
CERIUM COMPOUNDS
CERIUM FLUORIDES
CHARGED PARTICLES
COLOR CENTERS
COUPLING
CRYSTAL DEFECTS
CRYSTAL FIELD
CRYSTAL STRUCTURE
CURIUM COMPOUNDS
CURIUM FLUORIDES
CURIUM IONS
DOPED MATERIALS
ENERGY LEVELS
EXCITED STATES
FLUORIDES
FLUORINE COMPOUNDS
FREQUENCY MIXING
FUNCTIONS
GROUND STATES
HALIDES
HALOGEN COMPOUNDS
HAMILTONIANS
INTERMEDIATE COUPLING
ION IMPLANTATION
IONS
L-S COUPLING
MATERIALS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
POINT DEFECTS
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
TRANSPLUTONIUM COMPOUNDS
TRANSURANIUM COMPOUNDS
VACANCIES
WAVE FUNCTIONS