In situ optical and structural studies of H 2 chemisorption in C 8 K

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INTRODUCTION Optical reflectivity measurements of graphite intercalation compounds (GIC's) 1 have proven to be effective probes of the carbon TT bands near the Fermi level.2'3 When these measurements are analyzed within the framework of GIC bandstructure models4"6 quantitative values for the Fermi energy, charge per carbon atom and the optical mass can be obtained. 23 ' 7 Reflectance studies are usually performed on the cleaved c face of samples prepared from highly oriented pyrolytic graphite (HOPG). HOPG is a form of pyrolytic graphite whose crystallite c axes are highly oriented (deviations in orientation