Isotope shift studies of the E-X and D-X systems of the SiS molecule

Isotope shift data of the visible (3500-6200 AA) and the ultraviolet (2100-2600 AA) bands of the molecules 28Si32S and 28Si34S confirm the vibrational assignments proposed by Thomas and Bredohl et al. (1947) and further show that both the groups of bands belong to the E1Sigma+-X1Sigma+ system of the SiS molecule. The vibrational assignments of the 2500-3900 AA bands of the D1Pi-X1Sigma+ system are also confirmed from the present studies of the emission spectra of the isotopic molecules