title: Low-energy electron collisions with gas-phase uracil.
abstract: We have studied gas-phase collisions between slow electrons and uracil molecules with a view to understanding the resonance structure of the scattering cross section. Our symmetry-resolved results for elastic scattering, computed in the fixed-nuclei, static-exchange and static-exchange-plus-polarization approximations, provide locations for the expected pi* shape resonances and indicate the possible presence of a low-energy sigma* resonance as well. Electron-impact excitation calculations were carried out for low-lying triplet and singlet excitation channels and yield a very large singlet cross section. We discuss the connection between the resonances found in our elastic cross section and features observed in dissociative attachment.
authors.affiliation: A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: Carl
authors.initials: C
authors.lastname: Winstead
authors.forename: Vincent
authors.initials: V
authors.lastname: McKoy
mesh_terms: D000465:Algorithms; D004247:DNA / Q000737:chemistry; D004583:Electrons; D005740:Gases / Q000737:chemistry*; D012313:RNA / Q000737:chemistry; D013816:Thermodynamics; D014498:Uracil / Q000737:chemistry*
chemical_list: D005740:Gases; D014498:Uracil; D012313:RNA; D004247:DNA