2008年3月1日 · We have shown that the simulated U4f XPS spectrum of the free U 4+ cation has a significant multiplet structure that is strongly modified and hidden by interatomic effects due to ligand field splitting and redistribution of multiplet intensity from XPS allowed to low intensity XPS forbidden peaks.

U 4f 7/2 and 4f 5/2 peaks occur around 380 and 390 eV, respectively. The spin-orbit interaction separates these two levels by around 10.9 eV for uranium minerals (Fig. 1). The U 4f 7/2 peak...

2013年12月28日 · We demonstrate that treatment of the many-body character of the cluster wavefunctions is essential to correctly model and interpret the U4f XPS. Here we definitively show that shake configurations, where an electron is transferred from a dominantly O2p bonding orbital into dominantly 5f or 6d antibonding orbitals, are indeed responsible for the ...

xps技术，是一种高度灵敏且超微量的表面分析手段。 在运用XPS技术时，侧重于光电子峰的细致分析，借助计算机高效采集数据，并应用曲线拟合软件，以结合能为横轴、强度为纵轴，精确绘制并解析光谱图。

2023年8月30日 · U4f 5/2 and U4f 7/2 regions of the XPS spectra corresponding to the samples doped with 5% wt. of Gd 2 O 3 after sintering at 1650 °C (dashed line) and 1750 °C (solid line). The non-porous sample (solid line) exhibited the characteristic spectrum of UO 2.

2013年12月27日 · A rigorous study is presented of the physical processes related to X-Ray photoelectron spectroscopy, XPS, in the 4f level of U oxides, which, as well as being of physical interest in themselves, are representative of XPS in heavy metal oxides.

该研究确定了 XPS 检测过程中 X 射线照射引起的 U 4f 光谱的变化。 对于非半导体上的 U (VI)，由于铀酰分子的断裂，X 射线辐射导致 U 4f 7/2 负移至 ~ 380.8 eV，但未产生 U (IV) 物质。 然而，由于 U (VI) 的光催化还原，U (VI) 负载半导体的辐照迅速引起 U 4f 7/2 的负移 峰值达到 ~ 379.8 eV，这是 U (IV) 的特征。 此外，即使样品远离 X 射线束的中心 (>3971 μm)，也会发生明显的光还原。 基于这些发现，提出了减少由 X 射线照射引起的潜在误差的方法，包括使用最短扫描时 …

2009年5月1日 · 摘要 用XPS测定了19种不同成分和结构的铀矿物的U 4f 7/2 峰中U 6+ 、U 5+ 和U 4+ 谱带的赋存和结合能。 结果表明，这些矿物可分为以下四类：（1）铀酰羟基水合物化合物，不含或一价间隙阳离子； (2) 具有二价间隙阳离子的铀酰羟基水合物矿物； (3) 具有 (TO n ) 基团 (T = Si、P 和 C) 的铀酰含氧盐矿物，其中铀酰多面体的所有赤道 O 原子都与 (TO n ) 基团共享； (4) 具有 (TO n ) 基团（T = S 和 Se）的铀酰含氧盐矿物，其中一些赤道 O 原子仅在铀酰多面体之 …

A rigorous study is presented of the physical processes related to X-Ray photoelectron spectroscopy, XPS, in the 4f level of U oxides, which, as well as being of physical interest in themselves, are representative of XPS in heavy metal oxides.

2009年5月1日 · Here, we examine XPS spectra of a series of uranyl minerals of different composition and structure and try to understand what information can be extracted from the resultant spectra. The U 4f peaks are the strongest and most resolved peaks in the XPS spectrum of U (e.g. Teterin et al., 1981).