Abstract
We calculated the resonance condition for the radial breathing Raman
mode for single wall carbon nanotube (SWNT) bundles for light
polarization parallel and perpendicular to the tube axis. The radial
breathing modes that are not observed in isolated SWNTs, but are
observed in SWNT bundles, are assigned to a resonance process for light
with perpendicular polarization. Asymmetry between the valence and
conduction pi energy bands becomes essential for obtaining resonance
conditions. We find that due to a high joint density of states, armchair
SWNTs have the largest optical transition intensities. (C) 2004 Elsevier
B.V. All rights reserved.
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