Ion-ion interaction and energy transfer of 4+ transuranium ions in cerium tetrafluoride.

摘要

Dynamics of excited 5f electron states of the transuranium ions Cm(sup 4+) and Bk(sup 4+) in CeF(sub 4) are compared. Based on time- and wavelength-resolved laser-induced fluorescence, excitation energy transfer processes have been probed. Depending on concentration and electronic energy level structure of the studied 4+ transuranium ion, the dominant energy transfer mechanisms were identified as cross relaxation, exciton-exciton annihilation, and trapping. Energy transfer rates derived from the fitting of the observed fluorescence decays to theoretical models, based on electric multipolar ion-ion interactions, are contrasted with prior studies of 4f states of 3+ lanthanide and 3d states of transition metal ions. 16 refs., 1 tab.