Abstract Submitted to the    NANOTUBE'04 Conference:

Samples of HiPco single-wall carbon nanotubes (SWNTs) within bundles and individual tubes wrapped in sodium dodecyl sulfate (SDS) in aqueous solution are ivestigated by resonance Raman spectroscopy. Stokes and anti-Stokes Raman spectroscopy measurements of the radial breathing modes (RBM) using 76 excitation laser energies between 1.52 and 2.71 eV are reported. For semiconducting nanotubes, the electronic transition energies (Eii) measured by resonance Raman spectroscopy agree with the values measured by optical absorption and photoluminescence. For metallic nanotubes, not observed in photoluminescence experiments, the (n,m) assignment is obtained. Isolated nanotubes in solution and in bundles are observed to exhibit almost the same RBM frequencies while, for nanotubes within bundles, the transition energies are red-shifted. A detailed laser power dependence for SWNTs bundles is presented.