Energy up-conversion and trapping: Dynamics of 5f states of Bk sup 4+ in CeF sub 4

Technical Report · Tue Jan 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/6112487· OSTI ID:6112487

Liu, G K; Beitz, J V

Energy transfer mechanisms of excited 5f states of Bk{sup 4+} (0.05 atom %) in CeF{sub 4} containing circa 0.95 atom % Cf{sup 4+} have been investigated at 4 K. The observed anti-Stokes fluorescence arises from both up-conversion and two-photon excitation. Nonexponential decays of Stokes fluorescence are ascribed to both excitation-excitation annihilation and site-dependent trapping processes and, therefore, are not describable by the Inokuti-Hirayama or exciton annihilation models. Based on the Forster-Dexter energy transfer theory, a new model is developed to fit the observed fluorescence decay data. 16 refs., 3 figs.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6112487
• Report Number(s): ANL/PP-70969; ON: DE92003547
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
BERKELIUM IONS
CERIUM COMPOUNDS
CERIUM FLUORIDES
CHARGED PARTICLES
ENERGY LEVELS
ENERGY TRANSFER
EXCITED STATES
F STATES
FLUORESCENCE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IONS
LUMINESCENCE
MULTI-PHOTON PROCESSES
RARE EARTH COMPOUNDS
ULTRALOW TEMPERATURE