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The dominant feature in the second-order Raman spectra in graphite and SWNTs is the G' band feature arising from a two-phonon, intervalley, second-order Raman scattering process. For a high-quality sample, the G' spectra are completely free from defect contributions, and the experimental G'-band signal can be comparable in intensity to the G band. ˵Ã÷¸ßÎÂÍË»ð£¬Ê¹µÃÑùÆ·µÄȱÏݼõÉÙ£¬µ¼ÖÂG'µÄÇ¿¶ÈÔö´ó¡£ |

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