Polarization properties, high-order Raman spectra, and frequency asymmetry between Stokes and anti-Stokes scattering of Raman modes in a graphite whisker

@article{Tan2001PolarizationPH,
  title={Polarization properties, high-order Raman spectra, and frequency asymmetry between Stokes and anti-Stokes scattering of Raman modes in a graphite whisker},
  author={Pingheng Tan and Chengyong Hu and Jian Dong and Wanci Shen and Baofa Zhang},
  journal={Physical Review B},
  year={2001},
  volume={64},
  pages={214301}
}
The Raman spectra of a new type of graphite whiskers have been measured in the range of $150--7800{\mathrm{cm}}^{\ensuremath{-}1}.$ The intensity of the overtone $(2D)$ located at $\ensuremath{\sim}2700{\mathrm{cm}}^{\ensuremath{-}1}$ is found to be about 10 times stronger than that of the C-C stretching mode (G) at $1582{\mathrm{cm}}^{\ensuremath{-}1}.$ Because of the peculiar enhancement of the $2D$ mode, high-order Raman bands up to fifth order at $\ensuremath{\sim}7500{\mathrm{cm… 

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