The Kataura plot over broad energy and diameter ranges

Abstract The theoretical plot presenting the optical transition energies for carbon nanotubes as a function of tube diameter was proposed in 1999 and became the most used guide for researchers in the field. This work presents this plot obtained experimentally in a broad range of excitation laser energies (1.26–2.7 eV) and nanotube diameters (0.7–2.3 nm). The results include the poorly studied E S 33 and E S 44 optical transitions, and indicate the higher levels are not excitonic, but related to free electron–holes making band‐to‐band transitions. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)