Abstract
The absorption and circular dichroism spectra of Nd-doped Bi12SiO20 crystals were measured in the range 10 000 to 20 000 cm–1. The spectra showed electronic transitions related to only one type of Nd-related center: Nd substituting for Bi in position with symmetry C 1. The bands due to the transitions from the first Stark component of the ground state to Stark components of excites states (4 I 9/2 → 4 G 5/2 , 4 I 9/2 → 2 G 7/2 , and 4 I 9/2 → 4 G 7/2) were analyzed in detail. The dipole strength D 0k , rotatory power R 0k , and anisotropy factor G 0k of these transitions were calculated. The intensities of transitions to Stark components were shown to vary by more than one order of magnitude within an excited-state multiplet. The anisotropy factors of the 4 I 9/2 → 2 G 7/2 and 4 I 9/2 → 4 G 7/2 transitions, allowed in the magnetic dipole approximation, are, on the average, larger than that of the 4 I 9/2 → 4 G 5/2 transition, which points to a significant contribution of the magnetic moment (λ<μ>λ2) to the total intensity of the transition.
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Burkov, V.I., Egorysheva, A.V., Vasil'ev, A.Y. et al. Absorption and Circular Dichroism Spectra of Bi12SiO20<Nd> Crystals. Inorganic Materials 38, 1035–1039 (2002). https://doi.org/10.1023/A:1020533522862
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DOI: https://doi.org/10.1023/A:1020533522862