Dynamics of the Dissociating Uracil Anion Following Resonant Electron Attachment

Creators: Kawarai, Y.; Weber, T.; Azuma, Y.; Winstead, C.; McKoy, V.; Belkacem, A.; Slaughter, D. S.

Abstract

We report a combined experimental and theoretical investigation of dissociative electron attachment (DEA) to the nucleobase uracil. Using ion momentum imaging experiments employing a DEA reaction microscope we have measured 3-dimensional momentum distributions of specific anionic fragments following DEA to uracil by 6 eV electrons. From the measured anion fragment kinetic energy we determine the possible dissociation pathways and the total kinetic energy release. We employ electronic structure and electron scattering calculations to determine the probability for electron attachment in the molecular frame. Combining these calculations with the imaging measurements, we reveal several key features of the coupled electronic and nuclear dynamics of DEA.

Additional Information

© 2014 American Chemical Society. Received: September 8, 2014; accepted: October 17, 2014; published: October 17, 2014. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, and by the Division of Chemical Sciences, Geosciences, and Biosciences under Contracts No. DE-AC02-05CH11231 (LBNL) and DE-FG02-97ER14814 (California Institute of Technology). The work of V.M. and C.W. made use of the Jet Propulsion Laboratory's Supercomputing and Visualization Facility. Y.A. acknowledges the Japan Society for the Promotion of Science for support through Grants-in-Aid for Scientific Research (No. 23600009).

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