Photoemission study of the IBr graphite intercalation compound using the synchrotron radiation light source Original Research Article

We measured the photoemission spectra of the IBr graphite intercalation compounds (IBr–GIC) with stage-2 and stage-4 structures at 16 K with incident photon energies hν=40–200 eV. The peak positions of the I 4d and Br 3d core-levels are unchanged for the stage-2 and stage-4 IBr–GICs. Partial density-of-states of the I 5p and Br 4p states in the valence bands have been evaluated by resonant photoemission spectroscopy. These spectra indicate a significant hybridization between the host and the guest IBr in the van der Waals gap.