Abstract

Conical intersections play important roles in photochemistry and photobiology through their preeminent control over the course of electronic relaxation processes. In this Letter, we present results from a combined experimental and computational study of ultrafast internal conversion in nucleic acid bases and intramolecular charge transfer in N, N-dialkylaminobenzonitriles, which indicate that these photoprocesses occur through three-state conical intersections involving an intermediate electronic state.

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