STRUCTURE OF THE BAND SPECTRUM OF CuCl MOLECULE: II. ROTATIONAL STRUCTURE OF THE F–X BAND SYSTEM OF Cu⁶⁵Cl³⁵

The F–X band system of Cu 65 Cl 35 extending from 3700 to 4200 Å has been photographed in emission under high resolution. Rotational analysis of the (3,0), (2,0), (1,0), (0,0), (0,1), and (0,2) bands of the system has been made. The electronic transition involved is found to be 1 Π– 1 Σ. The Λ-type doubling in the 1 Π state is negligible. The principal molecular constants obtained are as follows (cm −1 units)[Formula: see text]