Abstract
Highly oriented pyrolytic graphite (HOPG), intercalated with the interhalogen molecules ICl and IBr, was investigated by x-ray absorption spectroscopy. From the polarization dependent near-edge (NEXAFS) and extended (EXAFS) x-ray absorption fine structure observed at the ClK, IL I,III, and BrK thresholds, we derive information on the structural arrangement of the intercalated halogen molecules. Of particular interest is the observation of an intercalation induced increase in the intramolecular halogen bondlength, which is found to be stage dependent for ICl-graphite and associated with the charge transfer from graphite to the halogen molecules.
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