Laser spectroscopy and dynamic of transient species. Progress report, June 1, 1992--May 31, 1993

Work on sub-Doppler spectroscopy of thioformaldehyde is nearing completion; the sub-Doppler structure in the H{sub 2}CS spectrum correlates with previous observations of anomalously long fluorescence lifetimes and reduced quantum yields of fluorescence under collision-free conditions. Singlet-triplet perturbations are large and occur haphazardly when levels in the two states are near- coincidence. High-resolution FTIR spectra of many bands of HCOCl and DCOCl have been recorded. Laser fluorescence on formic acid is being studied. Reactive jet spectroscopy is being used to produce new reactive intermediates in F{sub 2}/Ar gas streams. Preliminary experiments are underway in S{sub 3} and S{sub 4} systems