ESR study of dibarium copper formate tetrahydrate. Part II. Optical absorption and temperature dependence of spin-Hamiltonian parameters

Abstract

The variations in certain spin-Hamiltonian parameters of the Cu⁺⁺ ion in dibarium copper formate tetrahydrate with temperature have been studied. Optical absorption investigations on single crystals of the salt at room temperature and 90°K. are reported. The results are discussed in terms of a model in which vibronic mixing of certain electron levels of the Cu⁺⁺ ion play an important role.