Dissociative electron attachment to uracil deuterated at the N₁ and N₃ positions

Authors

A. M. Scheer, University of Nebraska - Lincoln
C. Silvernail, University of Nebraska - Lincoln
John A. Belot Jr., University of Nebraska - LincolnFollow
Gordon A. Gallup, UNLFollow
Paul BurrowFollow

Date of this Version

August 2005

Comments

Published in Chemical Physics Letters 411:1–3 (August 5, 2005), pp. 46–50. doi:10.1016/j.cplett.2005.06.006 Copyright © 2005 Elsevier B.V. Used by permission. http://www.sciencedirect.com/science/journal/00092614

Abstract

Deuteration at the nitrogen sites of uracil produces a striking change in the dissociative attachment cross-section at electron energies below 3 eV. In particular, sharp structures observed in uracil are absent or too small to observe. This result, as well as theoretical modeling, supports the earlier assignment of the sharp structure to vibrational Feshbach resonances that decay by tunneling of the N₁ hydrogen atom through the barrier created by the avoided crossing of the dipole bound anion potential surface by that of the lowest ²Σ valence anion state.