HIGH RESOLUTION STUDIES OF THE SPECTRA OF GeCl AND SnCl

Abstract

Spectra of GeCl and SnCl were excited in a radio frequency discharge at a low pressure. Bands of the GeCl molecule in the region 335-370 nm have been attributed to the $^{4}\Sigma^{-}- X^{2}\Pi$ transition on the basis of high resolution studies of the bands at 339.2 and 350.1 nm. The rotational analysis of the (0,0) band of the $^{4}\Sigma^{-}{3/2} - X^{2}\Pi{3/2}$ subsystem has been carried out. The $B^{\prime\prime}{O}$ value obtained by the author disagrees with that derived from a rotational analysis of the $B^{2}\Sigma^{+} - X^{2}\Pi{3/2}$ $subsystem^{1}$ The (0,0) subbands at 348.6 and 375.8 nm of the $^{4}\Sigma^{-} X^{2}\Pi$ system of the SnCl molecule have been recorded at high resolution and analyzed. The rotational constants for the $^{4}\Sigma^{-}{1/2}, ^{4}\Sigma^{-}{3/2}, X^{2}\Pi_{1/2}$ and $X^{2}\Pi_{3/2}$ states have been calculated. The constants calculated by the author agree well with the previous results for the $^{4}\Sigma^{-}{3/2}, X^{2}\Pi{1/2}$ and $X^{2}\Pi_{3/2}$ $substates^{2}$