Accession Number : ADA017559
Title : Exciton Dynamics and Host Sensitized Energy Transfer in Inorganic Crystals.
Descriptive Note : Final rept. 15 Sep 74-14 Sep 75,
Corporate Author : OKLAHOMA STATE UNIV STILLWATER DEPT OF PHYSICS
Personal Author(s) : Powell,George C. ; Hsu,Chang ; Venikouas,George E.
Report Date : 30 SEP 1975
Pagination or Media Count : 92
Abstract : Tunable dye laser spectroscopy was used to study energy transfer processes in CaWO4:Sm(3+) crystals. Fluorescence and excitation transitions for samarium ions in different crystal field sites in calcium tungstate were identified and used to study energy migration among samarium ions as a function of temperature, samarium concentration, time after the laser pulse, and pressure. The interaction mechanism causing energy migration is identified as electric quadrupole-quadrupole. At low temperatures only single step transfer between nearby ions takes place while at high temperatures multistep diffusion occurs efficiently.
Descriptors : *Energy transfer, *Crystals, *Samarium, Ions, Calcium compounds, Concentration(Chemistry), Pressure, Spectrum analysis, Crystal structure, Diffusion Theory, Molecular energy levels, Crystals, Tungstates, Fluorescence, Electron transitions
Subject Categories : Atomic and Molecular Physics and Spectroscopy
Solid State Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE