Abstract

The loss spectrum of low energy (0<Ep<300 eV) electron scattering from (100) tungsten has been experimentally investigated and mechanisms giving rise to fine structure studied. A very narrow, dense unoccupied conduction band state has been observed to function strongly in interband excitations involving the conduction bands, core orbitals, and adsorbed atoms. Interband excitations involving the tungsten 5p and 4f core orbitals and the 2s and 2p orbitals of adsorbed oxygen have been identified. Two separate binding states of adsorbed oxygen have been observed in the loss spectrum. The surface plasmon has been dissected from its position adjacent to the bulk plasmon and the ∠10 eV loss relegated to interband origins. The positions in energy of the bulk and surface plasmons as well as the low energy interband structure have been shown to be reasonably consistent with the available optical data.

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