Abstract Submitted to the    NANOTUBE'04 Conference:

Results from complete NIR (695 nm to 985 nm excitation) resonance Raman enhancement profiles obtained for radial breathing modes (RBM) of individually dispersed solution phase carbon nanotubes will be presented. The data allows definitive assignment of the semiconducting tube types observed, as well as for some metallics. Our results agree well with recently published predictions for transition energies and RBM frequencies. Results demonstrating a chirality dependence of Raman intensities will also be presented with discussion of the origin of the phenomenon. Similar enhancement profile data was obtained on aggregated nanotube samples. Comparison of data between individualized and aggregated nanotubes has allowed us to evaluate recent predictions for the behavior of interacting nanotubes. We discuss expectations for perturbations of electronic states and changes in RBM frequencies. We will also discuss the implications of these results for general Raman characterizatio n of carbon nanotubes, with an emphasis on evaluation of new nanotube separation techniques. Finally, we will present recent results on Raman imaging and characterization of ultralong CVD nanotubes produced by “rapid heating” methods.