Electronic State and Arrangement of Hydrogen Atoms in Ternary Graphite Intercalation Compounds C₈KH_0.61 —ESR, ¹H NMR and ¹³C NMR Studies

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We have studied ESR, ¹H NMR and ¹³C NMR in ternary graphite intercalation compounds C₈KH_0.61 prepared from the highly oriented pyrolitic graphite (HOPG). Although it has been controversial whether the hydrogen atom has a localized moment, our experiment proves non-existence of the localized moment. It is shown that the absorbed hydrogen molecules are dissolved into an atomic state and that the hydrogen atoms have a metallic character. The electronic state of hydrogen atoms and their geometrical arrangement are discussed.