Abstract
We apply the time-dependent local density approximation (TDLDA) to calculate dipole excitations in small carbon clusters. A strong low-frequency mode is found which agrees well with observation for clusters Cn with n in the range 7–15. The size dependence of the mode may be understood simply as the classical resonance of electrons in a conducting needle. For a ring geometry, the lowest collective mode occurs at about twice the frequency of the collective mode in the linear chain, and this may also be understood in simple terms.
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Yabana, K., Bertsch, G. Optical response of small carbon clusters. Z Phys D - Atoms, Molecules and Clusters 42, 219–225 (1997). https://doi.org/10.1007/s004600050357
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DOI: https://doi.org/10.1007/s004600050357