A THEORETICAL AND EXPERIMENTAL INVESTIGATION OF THE FORMATION OF S-2(-) FROM CS2 BY ELECTRON-IMPACT

Theoretical and experimental investigation of the formation of S-2(-) from CS2 by electron impact has been carried out. Molecular orbital ca lculations show that some of the low lying states of CS2- have lower p otential energy in the bent geometries suggesting a transformation in the geometric structure of the precursor molecular ion, leading to the formation of S-2(-). In contrast to the formation of S- and CS-, the kinetic energy associated with S-2(-) is small and disproportionate to the increase in electron energy, indicating the formation of S-2(-) i n vibrationally excited states due to the mechanism of its formation.