Abstract
A rotationally resolved fluorescence excitation spectrum of the origin band in the S1 ← S0 transition of N-methylcarbazole has been recorded in the collision-free environment of a molecular beam. Analyses of these data provide information about the structure of the isolated molecule in the two different electronic states. Additionally, large light-induced changes in the potential governing the torsional motion of the attached methyl group have been observed, V6 (S0) ≈ 80 ± 1 cm-1 and V6 (S1) ≈ 0.11 ± 0.3 cm-1.
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