Laser spectroscopy and crystal field analysis of Cm{sup 3+} diluted in Cs{sub 2}NaYCl{sub 6}

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.476042· OSTI ID:625387

Murdoch, K M ^[1]; Cavellec, R; Simoni, E; Karbowiak, M; Hubert, S ^[2]; Illemassene, M; Edelstein, N M ^[1]

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1. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California94720 (United States)
2. Institute de Physique Nucleaire, CNRS-IN2P3, 91406Orsay (France)

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 Cm{sup 3+} ion diluted in the host crystal Cs{sub 2}NaYCl{sub 6}. In this crystal the Cm{sup 3+} ion replaces a Y{sup 3+} ion at an octahedral site (O{sub h} 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 57cm{sup {minus}1}. Many of the {Gamma}{sub 8} symmetry levels exhibited small splittings, which was indicative of a site symmetry lower than O{sub h}. The energies of the most prominent vibronic features have been measured and assigned to specific vibrational modes of the CmCl{sub 6}{sup 3{minus}} 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 Cm{sup 3+} ion in this host. Blue {sup 6}P{sub 5/2}{r_arrow}{sup 8}S{sub 7/2} upconversion fluorescence was observed when pumping the orange {sup 8}S{sub 7/2}{r_arrow}{sup 6}D{sub 7/2} absorption transitions and explained by a phonon-assisted energy transfer mechanism. {copyright} {ital 1998 American Institute of Physics.}

• OSTI ID: 625387
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 108; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ABSORPTION SPECTRA
CESIUM CHLORIDES
CRYSTAL FIELD
CURIUM IONS
ELECTRONIC STRUCTURE
ENERGY LEVELS
EXCITED STATES
FLUORESCENCE
LASER SPECTROSCOPY
LINE NARROWING
MULTI-PHOTON PROCESSES
SODIUM CHLORIDES
YTTRIUM CHLORIDES