Photoemission intensities at the 3p threshold resonance of NiO and Ni
Photoemission intensities at the 3p threshold resonance of NiO and Ni
复制标题
NiO 和 Ni 3p 阈值共振处的光电发射强度
DOI：
10.1103/physrevb.27.2082
复制
发表时间：
1983
影响因子：
3.7
通讯作者：
Z. Hurych
中科院分区：
文献类型：
--
作者：
M. R. Thuler;R. Benbow;Z. Hurych
我们报告的3D发射和共振价带卫星在NiO和Ni的光电子能谱和强度分布。金属Ni中的Ni为3d 9构型，而NiO中的Ni为3d 8构型. NiO提供了一个机会来研究大量的空穴在d配置中的效果：对于NiO，我们发现一个非常强的共振卫星在9.2 eV和一个弱卫星在3d主峰以下的0.22 eV。9.2-eV伴线的强度约为Ni中6.2-eV伴线的两倍，这反映了NiO的空3d态的数量比Ni增加。NiO中的主要3D发射的强度分布示出了在共振阈值处的强（30%）下降，其能量对应于如用恒定最终能量谱技术测量的主要吸收阈值和如通过X射线光电子能谱确定的3 p芯能级的结合能。我们的解释是不完整的，因为云的NiO的理论图片，但镍和NiO的结果同意定性与最近的计算表明，在这两种情况下，涉及类似的过程。卫星-主线分离能量的3 eV的强烈增加可能是由于NiO中的3d电子的强烈局域化，这应该导致有效库仑相互作用的增加。
We report photoemission spectra and intensity profiles of the 3 d emission and the resonant valence-band satellites in NiO and Ni. Ni in Ni metal is in a 3 d 9 configuration, but Ni in NiO is in a 3 d 8 configuration. NiO gives an opportunity to study the effect of a larger number of holes in the d configuration: For NiO we find a very strong resonant satellite at 9.2 eV and a weak satellite at∼ 22 eV below the main 3 d peak. The intensity of the 9.2-eV satellite is about twice that of the 6.2-eV satellite in Ni, which reflects the increased number of empty 3 d states of NiO as compared with Ni. The intensity profile of the main 3 d emission in NiO shows a strong (30%) dip at the resonance threshold, the energy of which corresponds to the main absorption threshold as measured with the constant-final-energy spectroscopy technique and to the binding energy of the 3 p core levels as determined by x-ray photoelectron spectroscopy. Our interpretation is incomplete because of the clouded theoretical picture of NiO, but the results for Ni and NiO agree qualitatively with recent calculations indicating that similar processes are involved in both cases. The strong increase of 3 eV in the satellite-main line separation energy could be due to the strong localization of the 3 d electrons in NiO, which should lead to an increase in the effective Coulomb interaction.