Multiplet effects in the Ru L2,3 x-ray-absorption spectra of Ru (IV) and Ru (V) compounds

IF 9.3 2区 化学 Q1 CHEMISTRY, PHYSICAL Catalysis Reviews-Science and Engineering Pub Date : 2000-02-15 DOI:10.1103/PHYSREVB.61.5262
Z. Hu, H. Lips, M. Golden, J. Fink, G. Kaindl, F. Groot, S. Ebbinghaus, A. Reller
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引用次数: 65

Abstract

We report combined experimental and theoretical investigations of x-ray absorption at the $\mathrm{Ru}{\ensuremath{-}L}_{2,3}$ and O-K thresholds of the Ru(IV) compounds ${\mathrm{RuO}}_{2}$ and ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ and of the Ru(V) compound ${\mathrm{Sr}}_{4}{\mathrm{Ru}}_{2}{\mathrm{O}}_{9}.$ Significant differences in the intensity distribution of the ${t}_{2g}$-related and ${e}_{g}$-related peaks between the ${L}_{3}$ and the ${L}_{2}$ edges are found, due to the combined effects of $4d$ spin-orbit coupling and the interelectronic Coulomb interaction described by the Slater integrals. The observed spectral features can be well reproduced by crystal-field-multiplet calculations. With increasing the Ru valence from IV to V, the spectra are shifted by \ensuremath{\cong}1.5 eV to higher energy at the $\mathrm{Ru}{\ensuremath{-}L}_{2,3}$ edges and \ensuremath{\cong}1.0 eV to lower energy at the O-K edge, which is of the same order of magnitude as on going from the divalent to the trivalent late $3d$ transition-metal oxides.
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Ru (IV)和Ru (V)化合物的Ru L2、3 x射线吸收光谱中的多重效应
本文报道了Ru(IV)化合物${\mathrm{RuO}}{{2}$和${\mathrm{Sr}} {2}}{\mathrm{RuO}}}{4}$和Ru(V)化合物${\mathrm{Sr}} {4}}{\mathrm{Ru}} {2}}{\mathrm{O}}{9}在$\mathrm{Ru}}{{2}}{\mathrm{O}}{{9}的x射线吸收的实验和理论研究。${L}_{3}$和${L}_{2}$边的${t}_{2g}$相关峰和${e}_{g}$相关峰的强度分布存在显著差异,这是由于$4d$自旋-轨道耦合和由Slater积分描述的电子间库仑相互作用的综合影响。通过晶体场多倍计算,可以很好地再现观测到的光谱特征。随着Ru价从IV到V的增加,光谱在$ $ mathm {Ru}{\ensuremath{\cong}1.5 eV向$ $ mathm {-}L}{2,3}$边的高能量移动,$ $ O-K边的低能量移动为\ensuremath{\cong}1.0 eV,这与从二价到三价晚期$3d$过渡金属氧化物的变化具有相同的数量级。
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来源期刊
CiteScore
22.30
自引率
2.80%
发文量
29
期刊介绍: Catalysis Reviews is dedicated to fostering interdisciplinary perspectives in catalytic science and engineering, catering to a global audience of industrial and academic researchers. This journal serves as a bridge between the realms of heterogeneous, homogeneous, and bio-catalysis, providing a crucial and critical evaluation of the current state of catalytic science and engineering. Published topics encompass advances in technology and theory, engineering and chemical aspects of catalytic reactions, reactor design, computer models, analytical tools, and statistical evaluations.
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