Abstract
We employ a real-space pseudopotential method todetermine the ground state structure of the carbon cluster C6via simulated annealing and the corresponding optical absorptionspectra from the adiabatic time-dependent density-functional theory(TDDFT) and the local density approximation (TDLDA). It is found thatthe ground state structure of the carbon cluster C6 belongs to amonocyclic D3h structure and the calculated spectraexhibit a variety of features that can be used for comparison againstfuture experimental investigations.
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