Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 24, Pages 5222-5225Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.5222
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The Vibrational density of states of single-walt carbon nanotubes (SWNT) was obtained from inelastic neutron scattering data from 0 to 225 meV. The spectrum is similar to that of graphite above 40 meV, white intratube features are clearly observed at 22 and 36 meV. An unusual energy dependence below 10 meV is assigned to contributions from intertube modes in the 2D triangular lattice of SWNT bundles, and from intertube coupling to intratube excitations. Good agreement between experiment and a calculated density of states for the SWNT lattice is found over the entire energy range.
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