Abstract
Angle-resolved secondary electron emission (SEE) spectra exhibit, superimposed on an intense cascade background of multiply scattered electrons, fine-structural details which contain information on both bulk and surface properties of the emitting sample. However, the interpretation of the fine structure is not at all clear at present from an experimental point of view. To gain more insight, we have studied SEE from Cu(001)c(2 × 2)-Cl which serves as a model system since both the geometrical as well as the electronic structure are well known from other investigatios. All SEE features observed may be interpreted by emission either out of excited substrate bulk bands or out of adsorbate-induced surface resonance states. However, an interpretation of the “surface resonance” features in terms of emission out of substrate bulk bands and subsequent adsorbate-induced surface umklapp processes works equally well. Some consequences for future work are considered.
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