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Time-Resolved Dynamics in Iodide-Uracil-Water Clusters upon Excitation of the Nucleobase

preprint
revised on 16.09.2019, 16:14 and posted on 17.09.2019, 16:49 by Alice Kunin, Valerie S. McGraw, Katharine G. Lunny, Daniel Neumark
The dynamics of iodide-uracil-water (I·U·H2O) clusters following π-π* excitation of the nucleobase are probed using time-resolved photoelectron spectroscopy (TRPES). Photoexcitation of this cluster at 4.77 eV results in electron transfer from the iodide moiety to the uracil, creating a valence-bound (VB) anion within the cross-correlation of the pump and probe laser pulses. This species can decay by a number of channels, including autodetachment and dissociation to I or larger anion fragments. Comparison of the energetics of the photoexcited cluster and its decay dynamics with those of the bare iodide-uracil (I·U) complex provide a sensitive probe of the effects of microhydration on these species.

Funding

National Science Foundation CHE-1663832

National Science Foundation Graduate Research Fellowship

History

Email Address of Submitting Author

alicekunin@berkeley.edu

Institution

University of California, Berkeley

Country

United States

ORCID For Submitting Author

0000-0002-3002-8317

Declaration of Conflict of Interest

There are no conflicts of interest to declare.

Version Notes

This article has been submitted to The Journal of Chemical Physics.

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