Figure 4.

RBM frequencies of the SWCNTs as a function of aspect ratio. The SWCNTs have the same axial half-wave numbers, m = 1, and axial pressures, px = 1 TPa. However, they have circumference wave numbers n that vary from 1 to 4.

Lei et al. Nanoscale Research Letters 2011 6:492   doi:10.1186/1556-276X-6-492
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