Abstract
Resonance Raman spectra of semiconducting and metallic single-wall carbon nanotube bundles have been investigated in the spectral range between 600 and , which is associated with intermediate frequency modes. A large range of nanotube diameters corresponding to HiPco and electric-arc samples , and laser excitation energies between 1.62 and have been used in the measurements. A rich set of peaks is observed, some of them independent of the excitation laser energy and some exhibiting a steplike dispersive behavior. The nondispersive peaks are assigned. The model proposed by Fantini et al. [Phys. Rev. Lett. 93, 087401 (2004)] to explain the steplike dispersive behavior of the intermediate frequency modes is then extended to different SWNT diameters and different transitions, including semiconducting and metallic SWNTs.
- Received 28 April 2005
DOI:https://doi.org/10.1103/PhysRevB.72.085446
©2005 American Physical Society