Distribution of spectral moments for the radial breathing mode of single wall carbon nanotubes - art. no. 081406

Raman scattering of the radial breathing mode of single wall carbon nanotub es was measured with a large number of different laser lines. The first and the second moments of the spectral distribution were evaluated for all rec orded spectra and were found to exhibit damped oscillations with the excita tion energy. The oscillations originate from the confinement of the electro ns into states distributed within the van Hove singularities. An extended a s well as an approximate calculation of the moments yields very good agreem ent with the experiments and allows to determine the diameter of the nanotu be bundles. Using the approximate calculation the mean diameter and the wid th of the diameter distribution can be evaluated from a single Raman experi ment.