Measurement of Electronic Susceptibilities by Means of Nuclear Resonance Absorption

Abstract

The proton nuclear magnetic resonance is observed in two crossed capillary tubes embedded in a paramagnetic material in a constant external field. The resonance frequencies from the two capillaries depend on the respective demagnetizing factors. For Mn₂O₃ the two resonance lines are separated by 13.0 kc at 22.3 Mc, giving a mass susceptibility of 65×10⁻⁶ cgs, in agreement with values obtained by other methods. For a magnetic field homogeneity of about one part in 10⁷ over the sample, the ultimate sensitivity of the method would be 10⁻⁷ to 10⁻⁸ susceptibility unit. Measurements can be made at low temperatures.