Electric dipole intensity parameters for lanthanide 4f → 4f transitions

摘要: A general parametrization scheme for the electric dipole intensities of lanthanide 4f → 4f crystal‐field transitions is proposed. This sufficiently to accommodate any intensity mechanism based on ‘‘one‐electron’’ and ‘‘one‐photon’’ approximations lanthanide‐ligand‐radiation field interactions. It includes as a subset, familiar Judd–Ofelt–Axe parameters, AtpΞ(t, λ), but introduces additional parameters which are shown be essential in cases where lanthanide‐ligand pairwise interactions cannot assumed cylindrically symmetric. Expressions given calculating terms two specific mechanisms. Special consideration effects ligand polarizability anisotropy parameters. set ‘‘intrinsic’’ also introduced. These defined within context ‘‘superposition’’ model interactions, i...