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.

Trapped Hole Center at a Pb++Vacancy in γ-Irradiated PbCl2Crystals

“…The details of the treatment before and after the growth of the crystals have been described elsewhere. 11) 60 Co -ray irradiation was performed at a dose of 1:35 Â 10 8 roentgen at liquid nitrogen temperature (LNT) shielding the light.…”