| Autor: |
Shuang Zhao, Zhen-Hua Li, Wen-Ning Wang, Zhi-Pan Liu, Kang-Nian Fan, Yaoming Xie, Schaefer, Henry F. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 5/14/2006, Vol. 124 Issue 18, p184102, 10p, 1 Diagram, 9 Charts, 2 Graphs |
| Abstrakt: |
Twenty-three density functional theory (DFT) methods, including the second- and the third-generation functionals, are tested in conjunction with two basis sets (LANL2DZ and SDD) for studying the properties of neutral and ionic silver clusters. We find that DFT methods incorporating the uniform electron gas limit in the correlation functional, namely, those with Perdew’s correlation functionals (PW91, PBE, P86, and TPSS), Becke’s B95, and the Van Voorhis-Scuseria functional VSXC, generally perform better than the other group of functionals, e.g., those incorporating the LYP correlation functional and variations of the B97 functional. Strikingly, these two groups of functionals can produce qualitatively different results for the Ag3 and Ag4 clusters. The energetic properties and vibrational frequencies of Agn are also evaluated by the different functionals. The present study shows that the choice of DFT methods for heavy metals may be critical. It is found that the exact-exchange-incorporated PBE functional (PBE1PBE) is among the best for predicting the range of properties. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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