Low-energy electron collisions with gas-phase uracil |
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Authors: | Winstead Carl McKoy Vincent |
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Institution: | A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, CA 91125, USA. |
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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. |
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