Abstract
Highly oriented pyrolytic graphite (HOPG), intercalated with the halogen molecules ICl and IBr, was investigated by x-ray absorption spectroscopy. Information on the structural arrangement of the intercalated halogen molecules was derived from the polarization and temperature dependent near-edge (NEXAFS) and extended (EXAFS) x-ray absorption fine structure of the respective Cl-K, I-LI, III′ and Br-K thresholds. The observed change in the intramolecular bondlength of the halogen molecules in different surroundings is correlated with the energy separation of the σ∗- and π-resonances observed in the NEXAFS spectra.
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