Apparatus for Zeeman Effect Measurements on Microwave Spectra

Apparatus and experimental techniques for Zeeman-effect measurements on microwave spectra are described. The method uses a wave-guide type absorption cell and provides for either π- or σ-type observations. Molecular rotational and nuclear gyromagnetic ratios are found to be measurable to about 1 percent accuracy. A method is presented for sign determination of these gyromagnetic ratios using circularly polarized microwaves. The microwave components used in setting up the circularly polarized waves are described.