Wydział Chemii

Mirosław Karbowiak

A. Mech

Janusz Drożdżyński

2005

Chemical Physics

308

135-145

10.1016/j.chemphys.2004.08.014

Naukowa

Angielski

Artykuł

Single crystals of U⁴⁺:CsCdBr₃ were grown by the Bridgman–Stockbarger technique. It has been assumed, that U⁴⁺ ions are substituting two Cd²⁺ ions and possess the C_3v site symmetry. Thirty seven energy levels, located between 4000 and 25,000 cm⁻¹ and encompassing all but the ¹S₀ multiplet, were assigned from 7 K absorption spectra. The symmetry of the levels were determined on the basis of the observed small splitting of the Γ₃ doublets as well as by a comparison of low temperature absorption spectra of the U⁴⁺:CsCdBr₃ with that previously reported for U⁴⁺ in Cs₂UBr₆ and Cs₂ZrBr₆ single crystals. A crystal-field analysis was performed by fitting eight atomic (in the orthogonal formalism) and 6 crystal-field parameters to the experimental Stark levels with an r.m.s. deviation of 100 cm⁻¹. The obtained values of the Hamiltonian parameters are discussed and compared with those reported in previous analyses of U⁴⁺ ions. The relatively strong crystal field, resulting in N_v = 8530 cm⁻¹ proves that in the CsCdBr₃ crystals the U⁴⁺ ions are located at a high symmetry site.

https://doi.org/10.1016/j.chemphys.2004.08.014

http://www.elsevier.com