Optical spectroscopy and electron paramagnetic resonance of Pa/sup 4 +/ in ThBr/sub 4/ and ThCl/sub 4/ crystals
Journal Article
·
· J. Chem. Phys.; (United States)
OSTI ID:6482577
Polarized absorption and emission spectra of Pa/sup 4 +/ in ThCl/sub 4/ and ThBr/sub 4/ host matrices were recorded at different temperatures from 4.2 to 300 K in the infrared range. The seven crystal field levels of the 5f/sup 1/ configuration were determined from the optical data and fit by a parametrized model assuming a D/sub 2d/ site symmetry for the Pa/sup 4 +/ ion. However, at low temperature both matrices undergo a displacive phase transition and the low temperature structure is incommensurate and modulated. The halide position modulation reduces the site symmetry from D/sub 2d/ to D/sub 2/ for some Pa/sup 4 +/ ions, and, consequently, the shapes of some absorption bands are characterized by edge singularities. EPR experiments performed on these doped crystals provided g values for the ground state of Pa/sup 4 +/ which fit satisfactorily with the values calculated from the optical data.
- Research Organization:
- Laboratoire de Radiochimie, Institut de Physique Nucleaire, Universite de Paris-Sud, B.P. No. 1, 91406 Orsay Cedex, France
- OSTI ID:
- 6482577
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:5; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360000* -- Materials
ABSORPTION SPECTRA
ACTINIDE COMPOUNDS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL FIELD
ELECTRON SPIN RESONANCE
EMISSION SPECTRA
HALIDES
HALOGEN COMPOUNDS
INFRARED SPECTRA
IONS
LOW TEMPERATURE
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
PALLADIUM ADDITIONS
PALLADIUM ALLOYS
PALLADIUM IONS
PLATINUM METAL ALLOYS
RESONANCE
SPECTRA
THORIUM BROMIDES
THORIUM CHLORIDES
THORIUM COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE
360000* -- Materials
ABSORPTION SPECTRA
ACTINIDE COMPOUNDS
ALLOYS
BROMIDES
BROMINE COMPOUNDS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL FIELD
ELECTRON SPIN RESONANCE
EMISSION SPECTRA
HALIDES
HALOGEN COMPOUNDS
INFRARED SPECTRA
IONS
LOW TEMPERATURE
MAGNETIC RESONANCE
MEDIUM TEMPERATURE
PALLADIUM ADDITIONS
PALLADIUM ALLOYS
PALLADIUM IONS
PLATINUM METAL ALLOYS
RESONANCE
SPECTRA
THORIUM BROMIDES
THORIUM CHLORIDES
THORIUM COMPOUNDS
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE