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首页> 外文期刊>Journal of Physics. Condensed Matter >Evolution of the 2p satellite of Ni nano-clusters on TiO2(001) surfaces
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Evolution of the 2p satellite of Ni nano-clusters on TiO2(001) surfaces

机译：TiO2（001）表面Ni纳米团簇的2p卫星的演化

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摘要

Correlation enhancement of electrons in Ni nano-clusters due to confinement in reduced dimensions has been observed. Both the size and shape of the nano- clusters have a strong influence on the Ni 2p satellite structures. For small Ni clusters, apart from the 6 eV satellite, a 3 eV satellite structure emerges in Ni 2p(3/2) photoemission spectra due to the existence of the F-3 atomic state. However, the intensity of the 3 eV satellite decreases with increasing cluster size because the Ni 3d level becomes increasingly occupied in large clusters. The increased electron population in the 3d level is achieved through electron transfer from the free-electron-like 4sp states to the unhybridized pure 3d spin down states; the latter is lower in energy than the 3d-4sp hybridized states. The correlation-induced 6 eV satellite energy is enhanced by Ar+ bombardment. These observations make it feasible to gauge the Ni 3d electron population by probing the 2p photoemission spectra and to modify the supported Ni nano- clusters through thermal treatment and/or ion bombardment.
机译：已经观察到由于限制尺寸的缩小，Ni纳米团簇中电子的相关性增强。纳米簇的大小和形状都对Ni 2p卫星结构有很大影响。对于小的Ni团簇，除了6 eV卫星以外，由于F-3原子态的存在，在Ni 2p（3/2）光发射光谱中出现了3 eV卫星结构。但是，3 eV卫星的强度会随着簇大小的增加而降低，因为Ni 3d能级越来越多地被大簇占据。通过将电子从类自由电子的4sp态转移到未杂交的纯3d自旋降态，可以实现3d态电子群的增加。后者的能量低于3d-4sp杂化态。 Ar +轰击增强了相关诱导的6 eV卫星能量。这些观察结果使得通过探测2p光发射光谱来测量Ni 3d电子数量以及通过热处理和/或离子轰击改性负载的Ni纳米簇变得可行。

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