Abstract
The results of recent Raman scattering and infrared reflectance studies of donor and acceptor graphite intercalation compounds are reviewed along with corresponding measurements of pristine graphite. Newly calculated phonon dispersion curves of pristine graphite are discussed and related to the vibrational excitations of intercalation compounds. It is shown that proper sample characterization by X-ray and other techniques such as electron microprobe is crucial for correct interpretation of Raman and IR data. The nearest layer model for the intralayer vibrational excitations of graphite intercalation compounds is described in detail and justified by data on both donor and acceptor compounds. Intralayer intercalant modes in the FeCl3 and Br2 graphite systems are discussed and it is suggested that such modes are detectable as a result of resonance-Raman enhancement. The “zone-folding” and “disorder induced scattering” models for the Raman spectra of stage 1 alkali metal intercalation compounds are contrasted and the latter is shown to be more compatible with the observed spectra.
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