Perturbations in the 1A2 State of Thioformaldehyde Produced by High Vibrational Levels of the Ground State

Article abstract of DOI:10.1021/j150647a014

Measurements have been made of the asymmetry doublings in the lines of the ^rR3 branch of the 4₀¹ band of the <*> ¹A₂-<*> ¹A₁ system of thioformaldehyde by using the technique of intermodulated fluorescence.Line widths of ca. 5 MHz have been achieved and many small irregular perturbations up to ca. 300 MHz have been observed.These perturbations are not magnetically sensitive and must be caused by high vibrational levels of the ground state.The mixing of ground- and excited-state rovibronic levels produces irregularities in the fluorescence efficiencies of the latter.