  We present a resonance Raman study of the disorder-induced D mode in a sample
highly enriched with semiconducting (9,7) single-walled carbon nanotubes in the
excitation energy range of 1.49 - 2.05 eV. The intensity of the D mode shows a
resonance behavior near the optical transition of the (9,7) tube. The
well-known dispersion of the D-mode frequency, on the other hand, is not
observed at the resonance, but only above a certain excitation energy. We
explain our results by numerical simulations of the D-mode spectra.
