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The allowed and forbidden paramagnetic resonance transitions of MnH ions in single crystals of apatite [CalO(PO.). (F, CI)] and smithsonite [ZnCO.] have been investigated. The spin Hamiltonian parameters, describing the spectra observedat 300oK, were found from a third-order perturbation-theory estimate of the eigenvalues, calculated for the cases in which the magnetic field was parallel and perpendicular to the trigonal axis. Since in the case of apatite the D term was not very small compared with the Zeeman term, it had to be included also in the zeroth-order Hamiltonian.

The Allowed and Forbidden Transitions in the Paramagnetic Resonance of the Manganese Ion in Trigonal Sites in Apatite and Smithsonite