Light scattering from nanotubes
Raman spectra for single-wall carbon nanotubes were measured at room temperature after excitation at five different laser wavelengths. A wavelength of 1320 nm corresponds to photons of energy 0.94 eV, while the other wavelengths correspond to 1.17, 1.58, 1.92 and 2.41 eV. The peak at a frequency of 1580 cm1 does not depend strongly on the diameter of the tube, while the one at about 186 cm1 does.