Abstract
Electronic absorption spectra of neodymium acetate single crystals were measured at 293 and 4 K. The intensities of 4f–4f transitions were calculated and the Judd–Ofelt Ωλ parameters evaluated. These results differ in comparison with other lanthanide carboxylate compounds by relatively high `hypersensitive' transition intensity and the Ω2 parameter value. The vibronic mechanism of the 4f–4f transitions is discussed and the role of low-energy phonons is shown.
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