Electron-Molecular Scattering and Photoionisation, 123 (1988)

Negative Ion Resonance Electron Scattering from Oriented, Physisorbed O2

in "Electron-molecule scattering and photoionisation", eds. P.G. Burke and J.B. West (Plenum Press, New York, 1988), p. 123
R.E. Palmer, P.J. Rous and R.F. Willis

The physisorption of diatomic molecules on a crystalline solid surface at low temperature provides a means of orientating the molecular axis and thus studying low energy electron scattering from an oriented molecule. The cross-section for vibrational excitation of one monolayer of O2 on graphite at 25 K has a peak near 9 eV electron energy. The angular distribution of vibrationally inelastic electrons has been measured; comparison with calculated distributions, which include interference effects arising from multiple elastic electron scatttering within the molecular layer, allows us to determine the orientation of the O2 molecule on the surface and to identify the partial wave content of the resonance. The dominant partial wave (p(pi)) is consistent with the 2PIu compound state but not the 4SIGMAu.



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