Each of the many spectral features appearing in the Raman spectra of SWNTs provide important characterization information about SWNTs, with complementary information provided by ensembles of SWNTs in SWNT bundle samples and by isolated (n, m) SWNTs at the single nanotube level. Emphasis is given both to Raman spectroscopy for 1D systems and to the use of Raman spectroscopy to characterize the (n, m) structure, defects, and the various environmental effects encountered by SWNTs. Raman spectroscopy is also closely connected to PL spectroscopy of semiconducting SWNTs, since both experimental techniques are strongly sensitive to the transition energies of individual SWNTs, to their electronic density of states, and to their interactions. Combination of transport and other experiments with Raman spectroscopy will be highly desirable to further our understanding of the electronic and vibrational structure of SWNTs.
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