Dynamics of the Dissociating Uracil Anion Following Resonant Electron Attachment.
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.
†Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.|‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
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Kawarai
‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
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Weber
†Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.
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Azuma
¶A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.
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Winstead
¶A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, United States.
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McKoy
‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
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Belkacem
‡Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
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Slaughter
DEA; anion dynamics; electron attachment; electron impact excitation; resonant dissociation; transient anion