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Cryogenic ion spectroscopy of the green fluorescent protein chromophore in vacuo.

Zagorec-Marks, Wyatt and Foreman, Madison M. and Verlet, Jan R. R. and Weber, J. Mathias (2019) 'Cryogenic ion spectroscopy of the green fluorescent protein chromophore in vacuo.', The journal of physical chemistry letters., 10 (24). pp. 7817-7822.


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 20850 cm-1 (479.6 nm) with unprecedented accuracy. The vibrational spectrum establishes that the molecule is in the Z isomer at low temperature. At increased temperature, theS1 ← S0 band shifts to the red, which we tentatively attribute to emergent population of the E isomer.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Publisher statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Date accepted:04 November 2019
Date deposited:13 November 2019
Date of first online publication:04 November 2019
Date first made open access:04 November 2020

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