Abstract
Resonant Raman scattering for one single wall carbon nanotube
spectroscopy is overviewed. First-order resonance Raman spectra of the
radial breathing mode of one carbon nanotube is of importance for
assigning (n, m) values to the nanotube. This assignment of (n, m)
values is confirmed by the chirality dependence of other phonon modes.
Second-order, one-phonon emission, and the inter-valley scattering
processes of two dimensional graphite and of single wall carbon
nanotubes are relevant to disorder-induced D-band Raman spectra. The
dispersive nature of the D-band Raman spectra is explained by double
resonance processes. Many weak Raman spectra appearing in the
intermediate frequency range, which have been observed for a long time
but never assigned so far, have recently been assigned as double
resonance Raman peaks. The second-order Raman phonon frequencies can be
used as a new fundamental tool for determining the phonon energy
dispersion relations, especially for disordered materials and for zone
boundary phonons.
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