Spectroscopic analysis of different types of single-wall carbon nanotubes
Universität Wien, Institut für Materialphysik - Strudlhofgasse 4, A-1090 Wien, Austria
2 Eötvös University, Department for Biological Physics, Puskin U. 5-7, H-1088 Budapest, Hungary
3 Department of Chemistry, Rice University - Houston, TX 77005, USA
Accepted: 1 October 1998
The Raman response of the radial breathing mode in single-wall carbon nanotubes was analyzed for excitation with 10 different laser lines. The line shape was fitted with 14 Voigtian oscillators which could be correlated to tubes of different helicity. The strongest lines were observed between 172 and . For an assignment frequencies evaluated from a density functional calculation and scattering intensities for the resonance transitions were used. The 5 strongest lines observed are consistent with scattering from tubes with 11 different helicities. From the evaluation of the scattering intensities the nearest-neighbor integral between two carbon atoms on the curved sheet was found to be .
PACS: 78.30.-j – Infrared and Raman spectra / 78.66.Qn – Polymers; organic compounds / 63.20.Dj – Phonon states and bands, normal modes, and phonon dispersion
© EDP Sciences, 1998