Abstract
It has been shown that soft X-ray appearance potential spectroscopy (SXAPS) can be used as a probe of the conduction band density of states in several of the layer transition metal dichalcogenides, where the pronounced structure seen for TiS 2 agrees well with X-ray absorption data. In contrast, the complex structure seen in the SXAPS of pyrolytic graphite has previously been interpreted in terms of strong plasmon coupling. However, we find that the SXAP spectrum for vacuum cleaved pyrolytic graphite shows details not readily explicable by such an argument but which agree well with what would be expected on the basis of a conduction band self-convolution model. Further strong support for this interpretation is derived from XPS and SXAPS studies of the isostructural, isoelectronic boron nitride.
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