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Probing the Birth and Dynamics of Hydrated Electrons at the Gold/Liquid Water Interface via a Novel Optoelectronic Approach

preprint
submitted on 27.01.2020 and posted on 28.01.2020 by François Lapointe, Martin Wolf, Kramer Campen, Yujin Tong

The hydrated electron has fundamental and practical significance in radiation and radical chemistry, catalysis and radiobiology. While its bulk properties have been extensively studied, its behavior at buried solid/liquid interfaces is still unclear due to the lack of effective tools to characterize this short-lived species in between two condensed matter layers. In this study, we develop a novel optoelectronic technique for the characterization of the birth and structural evolution of solvated electrons at the metal/liquid interface with a femtosecond time resolution. We thus recorded for the first time their transient spectra (in a photon energy range from 0.31 to 1.85 eV) in situ with a time resolution of 50 fs. The transient species show state-dependent optical transition behaviors from being isotropic in the hot state to perpendicular to the surface in the trapped and solvated states. The technique will enable a better understanding of hot electron-driven reactions at electrochemical interfaces.

Funding

European Research Council (ERC)/no 772286

Fonds de recherche du Québec – Nature et technologies (FRQNT)

History

Email Address of Submitting Author

tong@fhi-berlin.mpg.de

Institution

Fritz Haber Institute of the Max Planck Society

Country

Germany

ORCID For Submitting Author

0000-0002-4084-7711

Declaration of Conflict of Interest

No conflict of interest

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