Single Crystal ESR Study of Mn2+ in Natural Tremolite

Abstract

The room temperature 9.5 GHz ESR spectrum of a natural tremolite single crystal containing 0.15% Mn²⁺ is analysed using both perturbation and numerical solutions to the experimental Hamiltonian. The analysis is in three parts: (i) allowed, ${\mathrm{\Delta \; M}}_S\text{=± 1}$ , ${\mathrm{\Delta \; M}}_I\text{=0}$ transitions, (ii) forbidden, ${\mathrm{\Delta \; M}}_S\text{=± 1}$ , ${\mathrm{\Delta \; M}}_I\text{>0}$ transitions, and (iii) forbidden, ${\mathrm{|\hspace{0.17em}\Delta \; M}}_S\text{\hspace{0.17em}|\hspace{0.17em}>\hspace{0.17em}1}$ transitions. Mn²⁺ occupies only a single site in the tremolite structure.