Raman Spectrum of Graphite

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  • F. Tuinstra
    Division of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106
  • J. L. Koenig
    Division of Macromolecular Science, Case Western Reserve University, Cleveland, Ohio 44106

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<jats:p>Raman spectra are reported from single crystals of graphite and other graphite materials. Single crystals of graphite show one single line at 1575 cm−1. For the other materials like stress-annealed pyrolitic graphite, commercial graphites, activated charcoal, lampblack, and vitreous carbon another line is detected at 1355 cm−1. The Raman intensity of this band is inversely proportional to the crystallite size and is caused by a breakdown of the k-selection rule. The intensity of this band allows an estimate of the crystallite size in the surface layer of any carbon sample. Two in-plane force constants are calculated from the frequencies.</jats:p>

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