D Field et al 2001 J. Phys. B: At. Mol. Opt. Phys. 34 4371 doi:10.1088/0953-4075/34/22/308
D Field1,6, J-P Ziesel2, S L Lunt1,7, R Parthasarathy3, L Suess3, S B Hill3, F B Dunning3, R R Lucchese4 and F A Gianturco5
Show affiliationsLow-energy collision studies have shown that the scattering cross section for electrons by benzene rises sharply at electron impact energies below ~ 200 meV. This was attributed in earlier work to electron attachment and formation of benzene anions with lifetimes τ≥1 µs. A detailed study of electron attachment to benzene is reported here that makes use of Rydberg atom techniques. The data provide no evidence for the formation of long-lived benzene anions, although a small collisional ionization signal is observed which is consistent with the formation of short-lived excited anions (τ≤3 ps).
An alternative explanation for the rapid rise in cross section at low energy is presented, based on ab initio scattering calculations. These calculations indicate that virtual state scattering takes place at low energies. Possible implications of this are briefly discussed.
34.80.Gs Molecular excitation and ionization
34.80.Lx Recombination, attachment, and positronium formation
31.15.A- Ab initio calculations
33.70.Ca Oscillator and band strengths, lifetimes, transition moments, and Franck-Condon factors
Issue 22 (28 November 2001)
Received 1 June 2001, in final form 17 September 2001
Published 12 November 2001
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