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Updated: Jul 4, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
Resonances in electron-impact electron detachment of C2-
Gabriela Halmová1, Jonathan Tennyson
1Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom.
Abstract:
Molecular R-matrix with pseudostate calculations are reported for the electron-impact ionization cross section of the carbon dimer anion. A (1)Sigma_(g)(+) resonance is found near the detachment threshold and two further resonances, of (3)Pi_(g) and (1)Pi_(g) symmetry, are found near 10 eV close to the structures observed experimentally. These unusual shape resonances are a result of the competition between the repulsive Coulomb interaction and the large, attractive polarizability of C2-. Use of the Born approximation to allow for higher partial waves gives a total cross section close to that observed experimentally.
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