Abstract
Fluorescence has been excited in the rotational subband heads of low lying vibrational levels in the A(1A2) state of thioformaldehyde. Single exponential fluorescence decays measured as a function of pressure yield linear Stern–Volmer plots from which gas kinetic quenching rates and collision‐free lifetimes of between 14 (000 band) and 4 μs (420 band) have been obtained. The results are interpreted in terms of solely radiative decay of the vibronic states investigated under isolated molecule conditions.
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