The Zeeman Effect in the Molecular Spectra of Hydrogen

The Zeeman effect in the molecular spectrum of hydrogen was observed for all six isotopic species for a field strength of nearly 35 000 gauss. Several thousand lines show modification in the field with many completely resolved patterns. When there is no $L$ decoupling, the splittings are represented by the simple theory. When there is $L$ decoupling, the splittings may be helpful for the evaluation of the degree of $L$ decoupling and other interactions. Abnormal effects occur for some lines which are related to the Paschen-Back effect in atomic spectra.