Figure 1

Electron diffraction pattern and resonant Raman scattering data from the same SWNT. (a) Top: Electron diffraction pattern, and bottom: Corresponding equatorial line with its fit (dotted line). (b) Left: Stokes-Raman map of the same nanotube. Right, top: Raman spectrum taken under excitation of 727.3 nm (1.705 eV). Middle, bottom: Stokes and anti-Stokes resonant excitation profile. Dotted lines: fitted data for the Stokes signal and calculated spectra for the anti-Stokes signal with the same parameters normalized by $K$ (see text). Acquisition time per Raman spectrum: 120 s, laser power: $100\mu \mathrm{W}$.Reuse & Permissions

Figure 2

Electron diffraction pattern and resonant Raman scattering data from the same zigzag rope of nanotubes. (a) Electron diffraction pattern of a rope (top) and corresponding equatorial layer-line (red) and (01) layer-line (blue) (bottom). The hexagon emphasizes the zigzag quality of the nanotubes, while the equatorial line and the (01) line demonstrates the crystallinity of the rope. (b) Top: Experimental Stokes profile (green triangles) with its fit (red dotted line) and the experimental anti-Stokes profile (pink triangles) with a generated anti-Stokes profile (blue dotted line) deduced from the Stokes fit and the theoretical $K$-ratio in a model where only one optical transition exists. Middle: Stokes profile (triangles) and corresponding fit (dotted line) in a two-level model (see text). Bottom: anti-Stokes profile (triangles) together with its two-level model curve (dotted line) calculated with the parameters given from the Stokes fit, normalized by $K$ (see text).Reuse & Permissions

Figure 3

Electron diffraction pattern and resonant Raman scattering data from the same two-nanotubes rope. (a) Top: Electron diffraction pattern. The arrows on the left (right) indicate the positions of the layers of the first (second) nanotube constituting the rope, and the bold arrow indicates the equatorial line. Bottom: corresponding equatorial line (red) and best fit (black) with the $(8,6)@(18,4)$. (b) Left, Stokes-Raman maps of the same rope with extracted resonant diffused signal profile (middle) and resonant Raman excitation profiles corresponding to the two modes (top and bottom). (c) Phonon mode of a (11,2)–(12,12) pair of nanotubes (see text).Reuse & Permissions