Abstract

Absorption spectra for Cn clusters (n = 2–8) are calculated using anadiabatic time-dependent density functional formalism within the localdensity approximation (TDLDA). We compare the calculated spectra withthose computed using a simple local density approximation approach. Itis readily observed that the TDLDA spectra display a significant blueshift with respect to the Kohn–Sham eigenvalue spectra. The calculatedspectra exhibit a variety of features that can be used for comparisonagainst future experimental investigations. We also obtain a significantthreshold absorption, which can distinguish different ground states ofthe carbon clusters.

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