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arXiv 0810.1359cond-mat.mtrl-sci
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解离吸附过程中氢分子与Au(111)之间电子转移的第一性原理研究

Electron Transfer from Hydrogen Molecule to Au(111) During Dissociative Adsorption: A First-Principles Study

Shigeyuki Takagi, Jun-ichi Hoshino, Hidekazu Tomono, Kazuo Tsumuraya

摘要:

用第一性原理方法研究了解离吸附的H2分子在Au(111)表面上的电子转移.部分电子从分子转移到衬底,并且在该过程中势能增加。初始能量的增加与由实空间密度泛函方法计算的孤立的、分离的和带正电荷的H2分子的能量增加相一致。势垒的形成是由于电子转移引起的分子的不稳定。吸附物和基质之间的电负性差异决定了电子转移的方向。

英文摘要:

We investigate the electron transfer from a dissociatively adsorbed H2 molecule to a Au(111) surface using the first-principles methods. A fractional electron transfers from a molecule to a substrate, and potential energy increases during the process. The initial energy increase coincides with that of the isolated, separated, and positively charged H2 molecule calculated by the real-space density functional method. The barrier formation is due to the destabilization of the molecule induced by the electron transfer. The electronegativity difference between the adsorbate and the substrate determines the direction of the electron transfer.

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