PYROLYSIS JET SPECTROSCOPY - THE S1-S0 BAND SYSTEM OF THIOFORMALDEHYDE AND THE EXCITED-STATE BENDING POTENTIAL

Rotationally resolved fluorescence excitation spectra of many bands of the approximately A 1A2-approximately X 1A1 system of the transient molecule thioformaldehyde have been recorded by using the pyrolysis jet spectroscopic technique. The rotational constants and precise band origins have been obtained from the rotational assignments. A simultaneous fit of all the available data to a semirigid invertor model has yielded a potential function for the out-of-plane bending coordinate and a planar excited-state equilibrium geometry.