title: Low- and high-frequency intermediate modes with step-like dispersion in resonance Raman scattering of carbon nanotubes.
abstract: Resonance Raman spectra of mixture of single-wall carbon nanotubes were investigated in details. The diameter distribution of the investigated nanotubes was estimated from the experimental frequencies of radial breathing modes. Two series of two-phonon lines revealing step-like behavior with excitation energy as well as non-dispersive single-phonon lines were registered in the intermediate frequency range 200-1200 cm(-1). Observed Raman lines were analyzed and their assignment to particular phonons was carried out. Step-like dispersive high intermediate-frequency modes in the range of 720-1000 cm(-1) are attributed to resonance two-phonon processes with combinations of optical and acoustical modes Low intermediate-frequency modes in the range of 300-650 cm(-1), also revealing step-like behavior, are attributed to resonance two-phonon processes with combinations of flexural optical and acoustical modes.
authors: V. Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, 45 Nauky pr., 03028 Kyiv, Ukraine.
authors: V V
authors: VV
authors: Strelchuk
authors: A S
authors: AS
authors: Nikolenko
authors: V O
authors: VO
authors: Gubanov
authors: M M
authors: MM
authors: Biliy
authors: L A
authors: LA
authors: Bulavin
mesh_terms: D008027:Light; D008422:Materials Testing; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D012542:Scattering, Radiation; D013059:Spectrum Analysis, Raman
chemical_list: D037742:Nanotubes, Carbon