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

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.


National Science Foundation CHE-1663832

National Science Foundation Graduate Research Fellowship


Email Address of Submitting Author


University of California, Berkeley


United States

ORCID For Submitting Author


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.