Structural (n, m) determination of isolated single-wall carbon nanotubes by resonant Raman scattering

We show that the Raman scattering technique can give complete structural in formation for one-dimensional systems, such as carbon nanotubes. Resonant c onfocal micro-Raman spectroscopy of an (n,m) individual single-wall nanotub e makes it possible to assign its chirality uniquely by measuring one radia l breathing mode frequency omega (RBM) and using the theory of resonant tra nsitions. A unique chirality assignment can be made for both metallic and s emiconducting nanotubes of diameter d(t), using the parameters gamma (0) = 2.9 eV and omega (RBM) = 248/d(t). For example, the strong RBM intensity ob served at 156 cm(-1) for 785 nm laser excitation is assigned to the (13, 10 ) metallic chiral nanotube on a Si/SiO2 surface.