Zero-field splitting ofCm3+inLuPO4single cryst

Crystal-field splitting, magnetic interaction, and vibronic excitations of 244Cm3+ in YPO4 and LuPO4

“…6. Since the next doublet is about 50 cm Ϫ1 higher for both systems, the Zeeman splitting is linear as the magnetic field increases up to 4 T. For comparing previous EPR studies, 11,14 with an assumption that the experimental errors were not significant, the differences between the effective g factors obtained from the EPR experiments and the present optical measurements are mainly due to data analyses. In the present work, the two components of the effective g factor were resulted from fitting the 8ϫ8 matrix of the Hamiltonian with the experimental data for the Zeeman splittings of the 8 S 7/2 ground state as a function of the applied magnetic field varying from 0 to 4.5 T. The contributions from off-diagonal terms are significant, even at zero field, but were not considered in the previous EPR work.…”

“…An actinide Cm 3ϩ ion replacing a Lu 3ϩ or Y 3ϩ ions has a D 2d site symmetry. 10,11 Consequently, the 8 S 7/2 ground multiplet and the first excited multiplet 6 D 7/2 near 16 500 cm Ϫ1 (Jϭ7/2) each split into four Kramers doublets by the crystal fields. Without an external magnetic field, the major M J components for the four crystal-field doublets are Ϯ1/2,Ϯ3/2,Ϯ5/2,Ϯ7/2, respectively.…”

“…[10][11][12] In the early 1980s, Abraham and co-workers initiated EPR and optical studies of single crystals of LuPO 4 and YPO 4 doped with actinide ions. 13,14 In the case of 244 Cm 3ϩ doped LuPO 4 and YPO 4 , EPR experiments revealed only the crystal-field splitting in two of the four Kramers doublets in the Jϭ7/2 ground state, while detection of crystal-field transitions from optical spectroscopy was hindered by radiationdamage-induced inhomogeneous line broadening.…”

“…Subse-quently, a much less radioactive isotope 248 Cm ͑␣-decay lifetime of 4ϫ10 5 y, in comparison with 18.1 y for 244 Cm) was used for reducing the inhomogeneous line broadening. Edelstein and collaborators 6,11,14,15 reported a series of optical spectroscopic studies of 248 Cm 3ϩ in LuPO 4 in which the crystal-field splitting of the ground state was resolved. Moreover, an application of the fluorescence line narrowing ͑FLN͒ method permitted the resolution of all of the four doublets within a total splitting of about 10 cm Ϫ1 .…”

Investigation of microscopic radiation damage in waste forms using ODNMR and AEM techniques. (EMSP Project Final Report)

“…Although TEM revealed no lattice amorphization, the crystallinity in the 18-year old *aCm-doped phosphate samples is not nearly as good as the same compounds that were doped with nonradioactive Ianthanide ions or much less radioactive actinides such as 248Cm [Kot et al 1993]. Based on our laser spectroscopic experiments and computational analyses, we attributed smaller scale defects and lattice distortion to the residuals of u-decay induced cascade displacements that were largely annealed at room temperature due to collective lattice dynamical interactions.…”