Single and multiple collision chemiluminescent studies of the SiOCS and GeOCS reaction. A study of the SiS and GeS a 3Σ +—X 1Σ + and SiS b 3Π — X 1Σ + intercombination systems and the nature of SiS* collisional quenching

Abstract

The chemiluminescent emission from silicon and germanium monosulfide resulting from the reaction of silicon and germanium metal with carbonyl sulfide has been studied under both single and multiple collision conditions. Included in this study is the observation of the SiS and GeS a a 3Σ + - X 1Σ + and SiS b 3Π - X 1Σ + intercombination band systems. The temperature dependence of the observed single collision spectra is analyzed to deduce the nature of the metal reactant beams and to determine the activation energies for formation of SiS* a 3Σ +, SiS* b 3Π and GeS* a 3Σ +. The significance of the activation energies is discussed. Lower bounds of 143.7 ± 1.6 kcal/mole and 132.2 ± 1.0 kcal/mole are determined for D u o(SiS) and D o o(GeS), respectively. Multiple collision spectral studies are used to initiate the exploration of collisional quenching.