  The present manuscript considers the application of the method of the
near-edge X-ray absorption spectroscopy (NEXAFS) for the investigation of the
graphene-based systems (from free-standing graphene to the
metal-intercalation-like systems). The NEXAFS spectra for the selected systems
are calculated in the framework of the approach, which includes the effects of
the dynamic core-hole screening. The presented spectral changes from system to
system are analysed with the help of the corresponding band-structure
calculations. The obtained results are compared with available experimental
data demonstrating the excellent agreement between theory and experiment. The
direct correlation between the strength of the graphene interaction with the
metallic substrate and the spectral distributions (shape and intensities of
\pi* and \sigma* features in the C K NEXAFS spectra) is found that can be taken
as a fingerprint for the description of interaction at the graphene/metal
interface.

Materials Science