title: Effective spin Hamiltonian model for superexchange interaction between rare earth ions in rare earth elpasolite crystals.
abstract: The fine structure of zero phonon lines in the electronic absorption spectra of lanthanide ion systems is interpreted by an effective spin Hamiltonian model. The splittings of several cm-1 observed for lanthanide ions with interionic separations near 1 nm in elpasolite lattices are attributed to superexchange interactions.
authors.forename: Xianju
authors.initials: X
authors.lastname: Zhou
authors.forename: Shangda
authors.initials: S
authors.lastname: Xia
authors.forename: Peter A
authors.initials: PA
authors.lastname: Tanner
mesh_terms: D003460:Crystallization; D007477:Ions; D008674:Metals, Rare Earth / Q000737:chemistry*; D008956:Models, Chemical; D011789:Quantum Theory; D013057:Spectrum Analysis
chemical_list: D007477:Ions; D008674:Metals, Rare Earth