Allowed and Forbidden Transitions in ESR of Mn2+ in PbCl2 Crystals

Abstract

Single crystals of PbCl₂ doped with Mn²⁺ have been investigated by ESR at X band and room temperature. The Mn²⁺ ion is found to be replaced for the Pb²⁺ ion. The spectrum can be described by a spin Hamiltonian for an ion in an orthorhombic crystal field. The parameters are found to be g _z =1.9996±0.0002, g _y =2.0004±0.0002, g _x =2.003±0.001, D=-495.9±0.1 G, E=-137.0±0.1 G, A _z =-84.8±0.2 G, A _y =-85.2±0.2 G, A _x =-85.2±0.5 G, a∼0 G and F∼0 G. The hyperfine structure splitting depends on the angle θ between the static magnetic field H and the z axis. the linear relation between the hyperfine constant A and the ionicity of the lattice holds even in PbCl₂. The experimental angular variation of intensities is in good agreement with the calculation by numerical diagonalization. The measured intensity is asymmetric about the nuclear quantum number m=0.