A resonance Raman study was made of the disorder-induced D-mode in a sample that was highly enriched with semiconducting (9,7) single-walled carbon nanotubes in the excitation energy range of 1.49 to 2.05eV. The intensity of the D-mode exhibited a resonance behavior near to the optical transition of the (9,7) tube. The well-known dispersion of the D-mode frequency, on the other hand, was not observed at the resonance, but only above a certain excitation energy. The results were explained by numerical simulations of the D-mode spectra.

Resonance Behavior of the Defect-Induced Raman Mode of Single-Chirality Enriched Carbon Nanotubes. J.Laudenbach, F.Hennrich, H.Telg, M.Kappes, J.Maultzsch: Physical Review B - Condensed Matter and Materials Physics, 2013, 87[16], 165423