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Raman images excited by a 632.8 nm laser, consisting of many Raman spectra recorded in a step of 0.5 m along the directions parallel to the double walled carbon nanotube(DWNT) rope axis, which was used here to probe the diameter distribution of the DWNT ropes. The ordinate unit is m and the vertical color bar represents the intensity of Raman spectra. It was noted that two narrow regions appeared in the RBM region with Raman shift < 20 cm^-1 deviation from the center (138 cm^-1 and 221 cm^-1), corresponding to the outer and inner diameter distribution width smaller than 0.30 nm, in good agreement with the statistic data from HRTEM observations. (More detail see the details in Journal of Physical Chemistry B 109 (2005) 7169.)

By LabRAM HR800 with LabSpec 4.02.