Abstract
One-phonon and two-phonon Raman spectra are reported for polycrystalline and microcrystalline graphites, excited at 1064 nm. Comparison with visible-excited spectra shows a large red shift and a strong enhancement of the intensity of the defect-activated one-phonon band and the two-phonon band, which is also dependent on surface treatments. A tentative model to explain such observations is suggested.
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