Molecular zeeman effect in NH3

High-resolution measurements of ΔM_j = 0 inversion transitions in ¹⁴NH₃ in 100 kG magnetic fields were made using a beam-maser spectrometer. The spectra show resolved splittings due to a different in molecular g-values for upper and lower inversion states with J = 3, K = 2. The observed difference in upper and lower inversion state g-values is g⁺(3,2)—g^?(3,2) = (1.38 ± 0.08) > 62;x 10^?4.