Erlangen 2022 – scientific programme

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MO: Fachverband Molekülphysik

MO 18: High-Resolution Spectroscopy

MO 18.3: Talk

Thursday, March 17, 2022, 15:15–15:30, MO-H5

Vibronic couplings in Serotonin — •Christian Brand^1,2 and Michael Schmitt¹ — ¹Heinrich-Heine University, Institute of Physical Chemistry I — ²German Aerospace Center, Institute of Quantum Technologies

We discuss vibronic couplings between the lowest two excited singlet states (L_a and L_b) of the neurotransmitter serotonin. In this derivative of indole, we expect a large energy gap between the two states of ≈ 3300 cm⁻¹ and thus only weak couplings. Nevertheless, using rotationally resolved electronic spectroscopy, we observe a mode-dependent rotation of the L_b transition dipole moment vector in the direction of the L_a. This study bridges the gap between strong and completely suppressed couplings, as previously observed for other indole derivatives.

[1] C. Brand and M. Schmitt, J. Mol. Struct. 1250, 131819 (2022)