Abstract
Previous calculations of the structures of isomers of phosphorus clusters up to P11 (density functional calculations with simulated annealing, local spin density approximation to the exchange-correlation energy) have been extended to arsenic clusters. The structures of Asn clusters are characterized by an almost uniform expansion (∼ 9%) of the corresponding Pn isomers. All cluster isomers have also been studied using a nonlocal, gradient corrected (Becke–Perdew) energy functional. While the structures are almost unchanged, there are significant improvements in the cohesive energies of all clusters. We present a simple picture to show that the improvements arise from contributions both in the atoms and near the ‘‘surface’’ of the clusters.
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