Site-selective spectroscopy and crystal field analysis of Cm3+ diluted in CsCdBr3

Autor: Keith M. Murdoch, M. Karbowiak, Solange Hubert, R. Cavellec, M. Illemassene, Norman M. Edelstein
Přispěvatelé: Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2000
Předmět:
Zdroj: Journal of Luminescence
Journal of Luminescence, Elsevier, 2000, 86, pp.45-60
ISSN: 0022-2313
1872-7883
DOI: 10.1016/s0022-2313(99)00173-8
Popis: The optical spectroscopy of the 248 Cm 3+ ion diluted in the host crystal CsCdBr3 has been investigated by laser selective excitation, excited state absorption, and fluorescence spectroscopy. Three distinct Cm3+ sites were observed. The principal site was assigned to the symmetric dimer center and its electronic structure was studied in detail. Analysis of its spectra resulted in the assignment of 58 energy levels up to 40 300 cm−1. These measured levels were fitted to the parameters of an empirical Hamiltonian with an rms deviation of 27.3 cm−1. The lifetimes of the six fluorescing levels have been measured at liquid-helium temperatures. Weak blue 6I7/2→8S7/2 upconversion fluorescence was observed when pumping the blue–green 8S7/2→6P5/2 absorption transitions of the principal site. It is explained by a phonon-assisted energy transfer mechanism.
Databáze: OpenAIRE
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