Origin of the high‐energy Raman modes in single‐wall carbon nanotubes

Abstract

We present a new interpretation of the origin of the first‐order Raman modes in single‐wall carbon nanotubes. Similar to the disorder‐induced D mode, the high‐energy modes are determined by double‐resonant scattering. Our model predicts an excitation‐energy dependence of the Raman frequencies, which we observe experimentally as well. We present preliminary results on the Raman spectra of metallic tubes.