  The circular dichroism (CD) spectra of single-wall carbon nanotubes are
calculated using a dipole approximation. The calculated CD spectra show
features that allow us to distinguish between nanotubes with different angles
of chirality, and diameters. These results provide theoretical support for the
quantification of chirality and its measurement, using the CD lineshapes of
chiral nanotubes. It is expected that this information would be useful to
motivate further experimental studies.
