抄録
The paramagnetic resonance absorption of Mn++ ions associated with the impurities of fluorine or divalent anions has been investigated in the single crystals of NaCl and LiCl. A resolved fine structure was observed in a “not quenched crystal” and it did not fade into a broad single line in contrast with the spectra of Mn++ ions which had been usually observed in alkali halides. The ground level splitting parameters have been determined in the spin Hamiltonian DS12+E(S22−S32) as follows: D=(−420±1)·10−4 cm−1, |E|=(65±1)·10−4 cm−1 for Mn++−F−, D=(−511±5)·10−4 cm−1, |E|=(25±5)·10−4 cm−1 for Mn++−X−−, a manganese divalent anion pair, in NaCl, and D=(−672±5)·10−4 cm−1, |E|=(12±3)·10−4 cm−1 for Mn++−X−− in LiCl, the principal axes of the spin Hamiltonian being in nearly agreement with the cubic axes of the crystal. The large value of D suggests the existence of the strong attractive force between Mn++ and impurity ion.
