New interpretations of XPS spectra of nickel metal and oxides
New interpretations of XPS spectra of nickel metal and oxides
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DOI：
10.1016/j.susc.2006.01.041
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发表时间：
2006-05-01
期刊：
影响因子：
1.9
通讯作者：
McIntyre, N. Stewart
中科院分区：
文献类型：
--
作者：
Grosvenor, Andrew P.;Biesinger, Mark C.;McIntyre, N. Stewart
目前对Ni金属的XPS谱的解释假设主要的6 eV卫星是由于两个空穴c3 d（9）4s（2）（c是核心空穴）终态效应。我们报告REELS观察AES在低电压的损失（等离子体激元和带间跃迁）对应的卫星结构在Ni金属2 p光谱。卫星附近的6 eV是由于占主导地位的表面等离子体损失。目前对氧化物和其他化合物的Ni 2 p光谱的解释是基于油电荷转移分配的主峰在854.6 eV和宽卫星中心在861 eV左右的cd（9）L和未屏蔽的cd（8）的最终状态配置，分别（L是一个配体空穴）。多重分裂已被证明是必要的Fe 2 p和Cr 2 p光谱轮廓和化学状态的分配。用Ni（OH）（2）、NiOOH和NiO的原子内多重峰包络重新研究了Ni 2 p态的归属。结果表明，Ni ~（2+）和Ni ~（3+）的自由离子多重态包络模拟了Ni（OH）_2和NiOOH的主线和卫星结构。拟合NiO Ni 2 p光谱曲线不像氢氧化物和羟基氧化物那样简单。它可能涉及原子能机构的贡献。非本地的电子耦合和屏蔽效应与多重态结构显着不同的自由离子发现MnO。提出了一种使用多重峰包络拟合这些光谱的方案。(c)2006 Elsevier B. V.保留所有权利。
A current interpretation of XPS spectra of Ni metal assumes that the main 6 eV satellite is due to a two hole c3d(9)4s(2) (c is a core hole) final state effect. We report REELS observation in AES at low voltages of losses (plasmons and inter-band transitions) corresponding to the satellite structures in Ni metal 2p spectra. The satellite near 6 eV is attributed to a predominant surface plasmon loss. A current interpretation of Ni 2p spectra of oxides and other compounds is based oil charge transfer assignments of the main peak at 854.6 eV and the broad satellite centred at around 861 eV to the cd(9)L and the unscreened cd(8) final-state configurations, respectively (L is a ligand hole). Multiplet splittings have been shown to be necessary for assignment of Fe 2p and Cr 2p spectral profiles and chemical states. The assignments of Ni 2p states are re-examined with intra-atomic multiplet envelopes applied to Ni(OH)(2), NiOOH and NiO spectra. It is shown that the free ion inultiplet envelopes for Ni2+ and Ni3+ simulate the main line and satellite structures for Ni(OH)2 and NiOOH. Fitting the NiO Ni 2p spectral profile is not as straightforward as the hydroxide and oxyhydroxide. It may involve contributions from interatomic. non-local electronic coupling and screening effects with multiplet structures significantly different from the free ions as found for MnO. A scheme for fitting these spectra using multiplet envelopes is proposed. (c) 2006 Elsevier B.V. All rights reserved.