Franck–Condon factors for the B–X system of S2

A frequency-doubled tunable dye laser has been used to selectively excite individual rotational levels within the vibrational levels υ′=2, and 6–9, of the B3Σ−u state of S2. Measurements of the intensity in emission of all the (υ,υ″) bands permit determination of the absolute Franck–Condon factors qv′v″. Combined with previous studies, this work completes the set of qv′v″ for bound–bound transitions within the B–X system. A simple pictorial representation of the Franck–Condon factors is presented, and conclusions may be drawn concerning overlap with the B-state wave functions above the predissociation limit.