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Evolution of (GaAl) n Clusters and Chemisorptions of H2 on (GaAl) n Clusters

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Abstract

The growth behavior of (GaAl) n (n = 1–12) and the chemisorptions of hydrogen on the ground state geometries have been studied with the three-parameter hybrid generalized gradient approximation due to Becke-Lee–Yang–Parr (B3LYP). The dissociation energy, the second-order energy differences, and the HOMO–LUMO gaps indicate that the magic numbers of the calculated (GaAl) n clusters are n = 4 and 6. To my knowledge, this is the first time that a systematic study of chemisorptions of hydrogen on gallium aluminum clusters. The onefold top site of aluminum atom is identified to be the most favorable chemisorptions site for one hydrogen chemisorptions on most (GaAl) n clusters. In general, dissociative chemisorptions of a hydrogen molecule on a top site of aluminum atom is found common for all sizes clusters considered here except for (GaAl) n (n = 1–3) clusters. The stability of the (GaAl) n H m complexes shows that both large second-order difference and large fragmentation energies for (GaAl)10H2 and (GaAl)11H2 make these species behaving like magic clusters.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (Grant no. 20603021), Youth Foundation of Shanxi (Grant no. 2007021009) and the Youth Academic Leader of Shanxi.

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  1. School of Chemistry and Material Science, Shanxi Normal University, Linfen, 041004, China

    Ling Guo

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  1. Ling Guo
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Correspondence to Ling Guo.

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Guo, L. Evolution of (GaAl) n Clusters and Chemisorptions of H2 on (GaAl) n Clusters. J Clust Sci 24, 575–589 (2013). https://doi.org/10.1007/s10876-012-0529-0

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  • DOI: https://doi.org/10.1007/s10876-012-0529-0

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