“Single collision” chemiluminescent studies of the La---OCS reaction—vibrational analysis of the LaS CΠ-XΣ system and determination of D0(LaS)

The chemiluminescent emission of lanthanum monosulfide resulting from the reaction of lanthanum with carbonyl sulfide was studied. A band system extending from 4300 to 4800 Å was observed. It was already analyzed and identified as the C²Π-X²Σ⁺ transition. A lower bound of 136.15 ± 0.42 kcal/mole was calculated for D⁰₀(LaS). The spectra and structure of LaS are compared to LaO.