Allowed and Forbidden Transitions in the Electron Spin Resonance of Mn²⁺ in CaSO₄

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The allowed and forbidden ESR lines of Mn²⁺ in CaSO₄ have been studied. The observed hyperfine constants (A_z=−99.1 gauss, A_x=A_y=−99.7 gauss) indicate strong ionicity of this crystal. The expressions for the separations of the forbidden doublets in the M=±3⁄2↔±1⁄2 transitions were obtained and compared with the experimental results. The intensity of the forbidden transitions due to cross terms (Remark: Graphics omitted.) was found to obey (sin2\varphi)² rule.