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Durham University

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Publication details for Prof. Jan R.R. Verlet

Zagorec-Marks, Wyatt, Foreman, Madison M., Verlet, Jan R. R. & Weber, J. Mathias (2019). Cryogenic Ion Spectroscopy of the Green Fluorescent Protein Chromophore in Vacuo. The Journal of Physical Chemistry Letters 10(24): 7817-7822.

Author(s) from Durham

Abstract

We present the spectrum of the S1  S0 transition of an anionic model for the
chromophore of the green fluorescent protein in vacuo at cryogenic temperatures, showing
previously unresolved vibrational features, and resolving the band origin at 20930 cm-1 (477.8 nm)
with unprecedented accuracy. The vibrational spectrum establishes that the molecule is in the Z
isomer at low temperature. At increased temperature, the S1  S0 band shifts to the red, which we
tentatively attribute to emergent population of the E isomer.