Abstract
Vibronic couplings between the two lowest excited singlet states of the neurotransmitter serotonin are studied both experimentally and theoretically. Using rotationally resolved electronic spectroscopy, we observe a mode-dependent rotation of the S1 transition dipole moment (TDM). This is rationalized as a coupling of the S1 (1Lb) to the S2 (1La) state, lying about 3300 cm−1 higher in energy.
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