Rotationally resolved fluorescence depletion spectroscopy of SCCS−

Rotationally resolved fluorescence depletion spectra have been observed for the vibronic bands of the A˜2Πg-X˜2Πu system of SCCS−. The observed line widths varied from 0.03 to ∼2 cm−1 due to the lifetime broadening in the upper levels of the vibronic bands. The excited state lifetimes have been estimated from the spectral line widths, which show a distinct vibrational mode dependence.