Paramagnetic Resonance of Manganese in Alkali-Chlorides

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The solution energies of manganese in LiCl and KCl crystals have been calculated by applying Haven’s method to the systems of MnCl₂-Alkali Chloride and by the use of the experimental value of the solution energy of manganese in NaCl, obtaining 0.85 eV for LiCl and −2.08 eV for KCl. The paramagnetic resonance spectra of manganese in quenched crystals of LiCl and KCl showed the hyperfine structure of divalent manganese ion in the crystalline field with non-cubic symmetry. By assuming the spin Hamiltonian of orthorhombic symmetry for the divalent manganese ion associated with a positive ion vacancy, the values of D and E have been calculated as D=109±10 gauss and E=25±10 gauss for LiCl. For KCl the observed spectra and their transformations by thermal treatments will be shown. The coloration of Mn doped crystals was carried out by γ-ray irradiation or by pointed cathode, and the resonance spectra of the colored crystals were observed.