Abstract
A frequency doubled, pulsed dye laser is used to excite electronic emission in quinoxaline vapor. The S 1 1 (Π*-n) vibrationless state (excited in the region of 3693 A) has a collision free lifetime of ≤ 50 nsec; statistical limit intersystem crossing occurs. A distinct two component “fluorescence”, with collision free lifetimes as long as ≈ 40 μsec, follows excitation in the S 2 1(Π*-Π) region (2800-3200 A). An intermediate strong coupling model, with extensive S 2-S 1 mixing and weaker singlet - triplet coupling, is proposed to explain experimental observations. The fast “fluorescence” component is interpreted in terms of a sequential decay theory of Tramer et al.
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