Original Publication Date
The Journal of Chemical Physics
DOI of Original Publication
Date of Submission
Using density functional theory and generalized gradient approximation for exchange-correlation potential, we have calculated the equilibrium geometries and energetics of neutral and negatively charged AlnCu (n=11,12,13,14) clusters. Unlike the alkali atom-doped aluminum clusters in the same size range, the copper atom resides inside the aluminum cluster cage. Furthermore, the 3d and 4s energy levels of Cu hybridize with the valence electrons of Al causing a redistribution of the molecular orbital energy levels of the Aln clusters. However, this redistribution does not affect the magic numbers of AlnCu clusters that could be derived by assuming that Cu donates one electron to the valence levels of Aln clusters. This behavior, brought about by the smaller size and large ionization potential of the copper atom, contributes to the anomalous properties of AlnCu− anions: Unlike AlnX− (X=alkali atom), the mass ion intensities of AlnCu− are similar to those of Al−n. The calculated adiabatic electron affinities are also in very good agreement with experiment.
Khanna, S. N., Ashman, C., Rao, B. K., et al. Geometry, electronic structure, and energetics of copper-doped aluminum clusters. The Journal of Chemical Physics 114, 9792 (2001). Copyright © 2001 AIP Publishing LLC.
Is Part Of
VCU Physics Publications