“Forbidden” lines in the ESR of Mn 2+ in calcite

Abstract

A complete analysis of the “half-field” ESR spectrum of Mn 2+ in a natural calcite crystal is presented using both perturbation and numerical solutions to the experimental Hamiltonian. A third-order perturbation refinement of the data from the half-field spectrum leads to Hamiltonian parameters in good agreement with earlier high-field solutions.