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首页> 外文期刊>Chemical Physics Letters >CLUSTER MODEL OF O-2(-) ADSORPTION ON REGULAR AND DEFECT SITES AND F-S CENTERS OF THE MGO(100) SURFACE
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CLUSTER MODEL OF O-2(-) ADSORPTION ON REGULAR AND DEFECT SITES AND F-S CENTERS OF THE MGO(100) SURFACE

机译:O-2(-)吸附在MGO(100)表面常规和缺陷部位以及F-S中心上的簇模型

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摘要

We have investigated the interaction of O-2(-) with Mg2+ ions at terraces, edges and corners and with the F-s centers of the MgO (100) surface by means of ab initio cluster model wave functions. While O-2 is unbound or weakly bound at surface cations, O-2(-) is electrostatically bound with adsorption energies from 2 to 4 eV depending on the local coordination. O-2 interacts with the electrons trapped at the F-s centers to form O-2(-) and F-s(+). In a similar way, O-2 becomes O-2(-) on F-s(+) centers with the formation of F-s(2+)-O-2(-) surface complexes. The high cost for the ionization of the F-s centers is compensated by the electrostatic attraction between O-2(-) and the charged vacancies. The effect of the local electric iield on the g-tensor is discussed. [References: 26]
机译:我们已经通过从头算簇模型波函数研究了O-2(-)与Mg2 +离子在阶地,边缘和拐角处以及与MgO(100)表面的F-s中心的相互作用。虽然O-2在表面阳离子上未结合或弱结合,但O-2(-)的静电吸附能是2-4 eV,取决于局部配位。 O-2与在F-s中心捕获的电子相互作用,形成O-2(-)和F-s(+)。以类似的方式,O-2在F-s(+)中心上变为O-2(-),形成F-s(2 +)-O-2(-)表面络合物。 F-2中心电离的高成本由O-2(-)和带电空位之间的静电吸引所补偿。讨论了局部电场对g张量的影响。 [参考:26]

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