Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
108 (1998), S. 6353-6361
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Laser selective excitation, excited state absorption, two-photon absorption, and fluorescence line narrowing techniques have been used to investigate the electronic energy level structure of the Cm3+ ion diluted in the host crystal Cs2NaYCl6. In this crystal the Cm3+ ion replaces a Y3+ ion at an octahedral site (Oh symmetry). Analysis of these spectra resulted in the assignment of 52 energy levels, which were fitted to the parameters of an empirical Hamiltonian with a rms deviation of 57 cm−1. Many of the Γ8 symmetry levels exhibited small splittings, which was indicative of a site symmetry lower than Oh. The energies of the most prominent vibronic features have been measured and assigned to specific vibrational modes of the CmCl63− moiety or to lattice modes. The lifetimes of four fluorescing levels have been obtained at room and liquid helium temperatures. These were analyzed to determine the processes which contribute to the relaxation of an excited Cm3+ ion in this host. Blue 6P5/2→8S7/2 upconversion fluorescence was observed when pumping the orange 8S7/2→6D7/2 absorption transitions and explained by a phonon-assisted energy transfer mechanism. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.476042
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