Single vibronic level emission spectroscopy of the A∼1A″→X∼1A′ system of bromochlorocarbene

In a search for transitions to the low-lying a˜3A″ state, we have recorded single vibronic level (SVL) emission spectra of bromochlorocarbene, CBrCl, which probe the vibrational structure of the X∼1A′ state up to ∼5500 cm−1 above the vibrationless level. These spectra reveal many previously unassigned levels, and a complete set of vibrational parameters was determined for the X∼1A′ state. The derived parameters are compared with recent ab initio predictions.