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Effects of Irradiation on the Graphite Density of States Analyzed by Photoelectron Spectroscopy

“…A common approach to extract information from Auger spectra is the use of the first derivative proposed many years ago, − which is, in fact, very sensitive to line-shape changes, thus providing both structural and chemical information. − On the other hand the analysis of the first derivative suffers from several problems, such as an inaccurate determination of the featuresʼ positions and the poor estimate of their relative intensities . To solve these problems, alternative analytical methods were proposed to obtain more details from Auger spectra. − Among them the negative of the second derivative (SD) has the advantage that peaksʼ positions correspond to that of the spectral components, and it allows one to extract spectral features otherwise not visible. , In previous papers we demonstrated that applying this method is possible to interpret the Auger spectrum of the pristine graphite on the basis of its band structure. , Here we start from this description and extend the investigation to Ar + -irradiated graphite and amorphous carbon films produced by plasma processes with the aim to suggest irradiated graphite as a standard for a more reliable quantification of the sp 2 , sp 3 hybrids in C-based materials.…”