Resonance excitation, intertube coupling and distribution of helicities in single-wall carbon nanotubes Available to Purchase

Photoselective resonance Raman scattering from laser ablation grown carbon nanotubes is presented. The resonance excitation was found to exhibit a quasi-oscillatory behavior. Assuming a Gaussian distribution of diameters we extracted values for a mean diameter and a width of the distribution within a simple model. In a more expensive calculation the contribution from all geometrically allowed tubes in a certain diameter range was considered. To match experiments and calculations, the frequencies obtained from the latter must be upshifted by ≈10 cm⁻¹. This is ascribed to the tube-tube interaction in the carbon nanotube bundles.