Dynamics of the B̃ excited state of thiophosgene

Thiophosgene, Cl2CS, has been excited with ps laser pulses in bulbs and a continuous supersonic expansion to nominal single vibronic levels in the B̃(1A1) state, and its emission spectra, temporal fluorescence decay profiles and quenching constants measured. Bound bright vibronic B̃ states decay exponentially by primarily radiative means. Further evidence is found of non-radiative passage of a subset of bright B̃ states to a dark portion of the B̃ state hypersurface.