The Zeeman Effect in the OH Bands

Apparatus and experimental procedure. The Zeeman effect in the ${}_{}{}^2{}_{}{}^{}\Sigma \to {}_{}{}^2{}_{}{}^{}\Pi$ OH bands in the near ultraviolet has been photographed with a 21-foot grating at 7 field strengths, varying from 5000 gauss to 34000 gauss. Up to 22000 gauss a discharge in water vapor was used as the source. Two types of quartz tubes were employed, one viewed laterally, the other end-on and placed between rectangular pole-faces. At high fields the Back-box arc, operating in water vapor, was employed.