Absorption and magnetic circular dichroism spectra of some f→d transitions in Ce3+:Na3Y (C4H4O5)3·2NaClO4·6H2O

Abstract

The polarized absorption and magnetic circular dichroism (m.c.d.) spectra of some 4f¹→ 5d¹ transitions in Ce³⁺ in trigonal crystals of optically active Na₃ Y(C₄H₄O₅)₃· 2NaClO₄· 6H₂O have been measured between 5 and 300 K up to energies of 43 400 cm^–1. Three of the five Kramers doublets of the excited 5d¹ configuration were located. M.c.d. data were used to determine the absolute value of the magnetic moment of the ground state as ca. 0.04₅β. The excited-state electronic properties are discussed using the descent in symmetry model. No circular dichroism was observed for any of the transitions indicating a value for the magnetic dipole oscillator strength of ⩽10^–12.