The Absorption Spectra of CdF and SnCl

Cadmium fluoride, vaporized in an electric furnace, shows no absorption in the region $\lambda \lambda 1950-7000$ at temperatures below 1350°C, but above this temperature a band system of CdF appears at $\lambda \lambda 2716-2924$. Strong continuous absorption is observed at higher temperatures. The spectrum of SnCl is photographed in absorption for the first time. The spectrum consists of the two band systems observed in emission, a new system in the farther ultraviolet, and two continua. Its similarity to the absorption spectrum of the homologous molecule SnF is discussed.