Fluorescence dynamics and cross relaxation of 4+ curium in cerium tetrafluoride

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5439756

Liu, G K; Beitz, J V

Fluorescence from Cm{sup 4+} has been observed for the first time. The dynamics of its emitting 5f state have been probed using time- and frequency-resolved laser-induced fluorescence. Nonexponential fluorescence decays were found from Cm{sub 0.001}Ce{sub 0.999}F{sub 4} and Cm{sub 0.05}Ce{sub 0.95}F{sub 4} at temperatures from 4.2 K to 300 K. A simple cross-relaxation model was found to fit the excited f-state dynamics of the Cm{sub 0.001}Ce{sub 0.999}F{sub 4} sample at low excitation intensity whereas an exciton-exciton annihilation model was necessary to model the observed fluorescence decay as exciton number density increased at higher excitation intensity. The annihilation model, modified to account for a small amount of trap site emission, was required to fit all the observed decays from the Cm{sub 0.05}Ce{sub 0.95}F{sub 4} sample. 15 refs., 2 figs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5439756
• Report Number(s): CONF-890813-2; ON: DE90003795
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
CERIUM COMPOUNDS
CERIUM FLUORIDES
CURIUM
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
LUMINESCENCE
METALS
RARE EARTH COMPOUNDS
RELAXATION
SAMPLE PREPARATION
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS