A potassium rf electrodeless discharge is described which, when placed in a kilogauss magnetic field, emits intense and well resolved Zeeman components of the resonance lines at 7665 Å and 7699 Å. The lamp is particularly suitable for studies of atomic fluorescence using Zeeman scanning techniques.
W. Berdowski, T. Shiner, and L. Krause, "Radiofrequency Source of Potassium Resonance Radiation for Use in Kilogauss Magnetic Fields," Appl. Opt. 6, 1683-1686 (1967)