Excitonic effects on radial breathing mode intensity of single wall carbon nanotubes

► The resonance Raman intensity for radial breathing mode as a function of diameter and chiral angle within extended tight binding scheme. ► Excitonic effect of the intensity is enhanced by the curvature and trigonal warping effects. ► The chirality dependence of RBM intensity shows that zigzag (and smaller diameter) nanotube gives much larger RBM intensity than near armchair (and larger diameter) nanotube.