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u 400 800 1200 1600

Frequency (cm-1)

Fig. 19.53. Dependence of infrared-active zigzag (n,0) nanotube mode frequencies on tubule diameter where d, = naa/v and a0 = 0.246 nm [19.83,87], u 400 800 1200 1600

Frequency (cm-1)

Fig. 19.53. Dependence of infrared-active zigzag (n,0) nanotube mode frequencies on tubule diameter where d, = naa/v and a0 = 0.246 nm [19.83,87], except for the 1590 cm"1 line, which is the strongest spectral feature in a 2D graphene sheet. Likewise, some candidates for observed spectral features in the infrared spectra (see Fig. 19.53) include 470, 670, 1250, and 1590 cm"1. The corresponding results for the dependence of the infrared- and Raman-active mode frequencies of armchair tubules show a wide spread of mode frequencies, as illustrated in Figs. 19.52 and 19.53 for zigzag nanotubes, but with significant differences in the detailed behavior [19.83,87].

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