Page 140 - Carbon Nanotubes

130 P. C. EKLUND et al.

M K ro 0,5 1 ,o
I
Wave Vector g (w)( o-" states/crn3cm-l)
(a)

I K r
wovevecior

42 cm-1 Ramon 1582 cm-1
active
t kz E2s*

lnfrare
1588 cm-1 act we 868 cm-1

Went 870 cm-1

(d (dl
Fig. 1. Phonon modes in 2D and 3D graphite: (a) 3D phonon dispersion, (b) 2D phonon dispersion,
(c) 3D Brillouin zone, (d) zone center q = 0 modes for 3D graphite.