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Contributions to the line shape of high-resolution Al Kα x-ray excited carbon $1s$ photoemission of highly oriented pyrolytic graphite are described and compared with previous work. A two-component system is used to model experimental results obtained from two photoelectron takeoff angles. The splitting between the two components is 0.47±0.02eV, with a variation in the intensity ratio consistent with that expected for the two takeoff angles. The photoemission lines are found to have a lifetime broadening ΓL of 0.128±0.006eV full width at half maximum (FWHM), an asymmetry {α} of 0.125±0.002, and additional broadening over that of the instrumental resolution of 0.28±0.04eV FWHM.
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Smith et al. (2002) studied this question.
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