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Laser spectroscopy and crystal field analysis of Cm diluted in CsNaYCl

Journal of Chemical Physics, ISSN: 0021-9606, Vol: 108, Issue: 15, Page: 6353-6361
1998
  • 21
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  • 9
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Metrics Details

  • Citations
    21
    • Citation Indexes
      21
  • Captures
    9

Article Description

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 ion diluted in the host crystal CsNaYCl. In this crystal the Cm ion replaces a Y ion at an octahedral site (O 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. Many of the Γ symmetry levels exhibited small splittings, which was indicative of a site symmetry lower than O. The energies of the most prominent vibronic features have been measured and assigned to specific vibrational modes of the CmCl 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 ion in this host. Blue P→S upconversion fluorescence was observed when pumping the orange S→D absorption transitions and explained by a phonon-assisted energy transfer mechanism. © 1998 American Institute of Physics.

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