The paramagnetic resonance spectra of two salts of manganese

Abstract

The magnetic resonance spectra of manganese fluosilicate and manganese ammonium sulphate have been analyzed using centimetre wave-lengths. It is shown that the splitting of the 6 S state is due mainly to the non-cubic symmetry of the crystalline field; the effect of the cubic field, hitherto assumed to be dominant, appears only as a small correction. The spectra show that the splitting is consistent with a mechanism suggested by Abragam & Pryce (1951), where it is attributed to magnetic interaction between the five electrons constituting the 6 S state. An extensive hyperfine structure is resolved, and the nuclear spin (5/2) of 55 Mn is confirmed. The spectroscopic splitting factor, g , is 2·000±0·001, very close to the free-spin value. The energy levels in zero magnetic field are evaluated for manganese ammonium sulphate.