Spectroscopy of small diameter single-wall carbon nanotubes

Resonance Raman spectroscopy of small diameter (below 1.2 nm) single‐wall carbon nanotubes (SWCNT) is presented. The diameter and chirality dependent many‐body corrections to the tight binding based Kataura plot are discussed. The radial breathing modes also show small chirality dependence, giving evidence for the deviations of the small nanotube diameters from the ideal folded graphene structure. The use of spectroscopy for the characterization of small environmental effects and the (n,m) population on HiPco and CoMoCAT SWNT samples is pointed out. The richness of the intermediate frequency modes is highlighted.