Hyperfine Structure in the EPR Spectrum of the Manganous Ion in Frozen Solutions

Abstract

EPR spectra of 10^—3M MnCl₂ were studied in various solutions at —180°C, and in 12M HCl or methanol the hyperfine structure was very similar. This hyperfine structure was then studied with respect to a changing Cl^—/Mn⁺⁺ ratio by addition of LiCl or HCl to the MnCl₂ solution. These spectra may be explained in terms of a spin Hamiltonian by considering only the M = ½↔M = —½ transitions, and the occurrence of forbidden Δm = ±1 transitions.