Abstract
The effect of Ar+ irradiation on the electronic structure of highly oriented pyrolytic graphite was examined by X-ray photoelectron spectroscopy. The valence band and core−valence−valence Auger lines, were investigated. The use of the second derivative of these spectral regions allowed the identification of the main spectral components of the density of state (DOS). A comparison of the virgin- and the irradiated-graphite double differentiated spectra enabled us to follow the effect of the Ar+ bombardment on the DOS components. A new interpretation of the electron rearrangement in the irradiated graphite and a comparison with those from amorphous carbon films are given. On the basis of our results we suggest the use irradiated graphite as a standard for the quantification of sp2, sp3 hybrids in C-based materials.
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