Loss‐spectroscopy on sparse arrays of aligned single‐wall carbon nanotubes

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<jats:title>Abstract</jats:title><jats:p>We performed angle resolved electron energy‐loss spectroscopy on vertically aligned single wall carbon nanotubes. We observe two distinct loss‐peaks in the energy range from 4:6 eV to 5:1 eV. This doublet of loss‐peaks is attributed to the on‐axis and crossed plasma oscillations of the π electrons in sp<jats:sup>2</jats:sup> carbon.</jats:p><jats:p>The unique identification and assignment of these two oriented excitations is derived from their dispersion relations. The available momenta are aligned on the nanotube axis and reflect the confinement of a particle on a wire. The observed angle resolved loss‐peaks are a gapless extension of polarized optical spectroscopy into finite momenta. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)</jats:p>

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