Submillimeter EPR spectroscopy of lanthanide compounds: Pair centers of Ho3+ in CsCdBr3

Abstract

High-frequency EPR spectra corresponding to magnetic dipole transitions between the doublet-singlet-doublet group of the lowest crystal field levels of the trigonal single ion and the symmetric dimer centers in CsCdBr3 have been studied. For the dimer center, the absorption spectra in the manifold of the lowest 1024 electron-nuclear states are simulated by successive diagonalization of the electron-nuclear Hamiltonian which includes the crystal field, the electronic Zeeman energies, the magnetic and quadrupole hyperfine interactions, and the dipole-dipole interactions between the paramagnetic ions. The crystal field parameters of Ho3+ ions in the symmetric dimer are determined. © 1998 Elsevier Science S.A.