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Competition between photodetachment and autodetachment of the 2(1)pi pi* state of the green fluorescent protein chromophore anion

Mooney, CRS; Parkes, MA; Zhang, L; Hailes, HC; Simperler, A; Bearpark, MJ; Fielding, HH; (2014) Competition between photodetachment and autodetachment of the 2(1)pi pi* state of the green fluorescent protein chromophore anion. JOURNAL OF CHEMICAL PHYSICS , 140 (20) , Article ARTN 205103. 10.1063/1.4874643. Green open access

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Abstract

Using a combination of photoelectron spectroscopy measurements and quantum chemistry calculations, we have identified competing electron emission processes that contribute to the 350–315 nm photoelectron spectra of the deprotonated green fluorescent protein chromophore anion, p-hydroxybenzylidene-2,3-dimethylimidazolinone. As well as direct electron detachment from S0, we observe resonant excitation of the 21ππ* state of the anion followed by autodetachment. The experimental photoelectron spectra are found to be significantly broader than photoelectron spectrum calculated using the Franck-Condon method and we attribute this to rapid (∼10 fs) vibrational decoherence, or intramolecular vibrational energy redistribution, within the neutral radical.

Type: Article
Title: Competition between photodetachment and autodetachment of the 2(1)pi pi* state of the green fluorescent protein chromophore anion
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4874643
Publisher version: http://dx.doi.org/10.1063/1.4874643
Additional information: © 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. PubMed ID: 24880334
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1433905
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