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arXiv 1402.0730physics.chem-phcond-mat.mtrl-sci
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芳香族小分子在金表面吸附的DFT定域基组研究

Adsorption of small aromatic molecules on gold: a DFT localized basis set study including van der Waals effects

Luiza Buimaga-Iarinca, Cristian Morari

摘要:

我们比较了密度泛函理论(DFT)的结果,通过使用三种类型的范德华交换相关泛函和定域基组计算得到的小芳香分子(苯,吡啶和噻吩)在金表面上的吸附。我们发现,分子表面结合能的值取决于BSSE效应和交换相关泛函的倾向高估分子表面以及放松系统内的金-金距离之间的相互作用。因此,我们发现,通过使用不同类型的LCAO基组或几何模型的分子在表面上的吸附,结合能可以变化高达100%。的物理参数的计算所产生的关键分析,提出了每个交换相关功能。

英文摘要:

We compare the density functional theory (DFT) results on the adsorption of small aromatic molecules (benzene, pyridine and thiophene) on gold surfaces obtained by using three types of van der Waals exchange-correlation functionals and localized basis set calculations. We show that the value of the molecule surface binding energy depends on the interplay between the BSSE effect and the tendency of the exchange-correlation functionals to overestimate both the molecule-surface as well as the gold-gold distances within the relaxed systems. Consequently, we find that by using different types of LCAO basis sets or geometric models for the adsorption of the molecules on the surface, the binding energy can vary up to 100 %. A critical analysis of the physical parameters resulting from the calculations is presented for each exchange-correlation functional.

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