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Citation: Xu Yi-Jun, Li Jun-Qian, Zhang Yong-Fan, Chen Wen-Kai. Theoretical Study of O₂ Adsorption on Perfect and Defect Sites of M (001) Surface[J]. Acta Physico-Chimica Sinica, ;2003, 19(05): 414-418. doi: 10.3866/PKU.WHXB20030507 shu

Theoretical Study of O₂ Adsorption on Perfect and Defect Sites of M (001) Surface

1.
State Key Laboratory of Structural Chemistry, Department of Chemistry, Fuzhou University, Fuzhou　350002

Received Date: 24 September 2002
Available Online: 15 May 2003

The adsorption of O2 on the perfect and lowcoordinated sites of M (001) surface has been studied with the finite cluster models embedded in a large array of point charges by density functional method. The point charge value was determined by self－consistence technique. Different kinds of possible models of O2 adsorbed on M (001) surface were calculated. The optimization of the geometry, calculation of the adsorption energy, vibrational frequency and analysis of the Mülliken population to those adsorption models were carried out. The results indicate that cationic site in the lowest coordinated corner is the most advantageous position for O2 adsorbed on M (001) surface. The O－O bond strength is considerably weakened when O2 lies flatly on the Mg atom at the corner(Mg3c). The calculated adsorption energy of O2 on M (001) perfect surface is in od agreement with experimental value. For O2 adsorbed on the perfect surface embedded in nominal ±2.0 e point charges and on perfect surface using the bare cluster, the adsorption energies given in this paper show that they have a large deviation from the experimental value. The vibrational frequency of adsorbed O2, which is experimentally difficult to measure due to the existence of isotope exchange, was also calculated.
- O₂;Adsorption;M (001) surface;Defect site;Density functional theory
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Theoretical Study of O2 Adsorption on Perfect and Defect Sites of M (001) Surface

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通讯作者: 陈斌, bchen63@163.com

Theoretical Study of O₂ Adsorption on Perfect and Defect Sites of M (001) Surface