Low-energy dissociative electron attachment to uracil molecules in the gas phase is partly controlled by interaction between the lowest σ * resonance with a dipole-supported anion state. We calculate this contribution using a combination of the finite element discrete model with the resonance R-matrix theory. Deuterated uracil is investigated, also, and a strong isotope effect is found. The results agree qualitatively and semiquantitatively with experimental data, but for a complete description

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... of the process the interaction between a second N-H bond σ * resonance in the molecule and the second π * resonance should be included.