Soft XAS is a more direct technique to provide information about the electronic structures of metal elements because it can directly detect the TM-3d states through a dipole-allowed 2p to 3d transition. Besides, it can also access the excitation energy range …

XAS（synchrotron X-ray absorption spectroscopy）可以提供有关配位环境和被探测原子化学状态等有价值的信息，并且硬X射线具有研究原位电化学反应动态过程的能力，有利于建立更精确的构效关系，成为当下催化剂机理研究的不二之选！

如果k边吸收谱还在中能或者软线那就只能测软xas。如果k边谱在硬线范畴、l m边在软线范畴，则看你需要什么信息。k边价态体现在吸收边，近边看立体几何结构，远边看径向几何结构。l m边的软线谱，价态和局域结构综合体现到谱形上。

2017年11月10日 · This Review summarizes the experimental techniques employed in XAS studies of liquid samples and computational methods used for interpretation of the resulting spectra and summarizes salient experiments and results …

2021年1月22日 · Soft X-ray spectroscopy, for example, X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES), and resonant inelastic soft X-ray scattering (RIXS), is an element-specific technique with sensitivity to the local chemical environment and structural order of the element of interest.

Soft X-ray absorption in situ studies of heterogeneous catalysts have been applied to areas such as copper methanol oxidation catalysts and cobalt Fischer–Tropsch type catalysts over a period of around two decades. The technique has the potential to offer several advantages for studying heterogeneous catalysts against hard X-ray XAS in: the ...

2025年2月26日 · TR-XAS stands for time-resolved X-ray absorption spectroscopy, which measures the absorbance of X-ray light as a function of the time delay between a pump pulse and the X-ray probe pulse.

2014年9月1日 · In this study, in situ soft X-ray absorption spectroscopy (soft XAS) technique, which enables us to analyze electronic structures of oxides at elevated temperatures while controlling atmospheric conditions, was developed.

The present review provides an in-depth understanding on how soft XAS techniques unravel the correlations between structure and performance in 2D photo/electrocatalysts, which could guide the rational design of highly efficient catalysts for photo/electrocatalytic water splitting.

According to the energy of X-ray, XAS can be divided into soft XAS (<2 keV or 1 keV) and hard XAS (>5 keV). Hard XAS has greater penetration, which can realize deep observation and in-situ observation, and is mainly used for bulk measurement. Soft XAS is more sensitive to electronic structure and can obtain accurate valence states.