Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany.
Anal Chem. 2012 Feb 21;84(4):1907-14. doi: 10.1021/ac202285d. Epub 2012 Feb 3.
A new approach for chemical speciation in stratified systems using 3D Micro-XAFS spectroscopy is developed by combining 3D Micro X-ray Fluorescence Spectroscopy (3D Micro-XRF) and conventional X-ray Absorption Fine Structure Spectroscopy (XAFS). A prominent field of application is stratified materials within which depth-resolved chemical speciation is required. Measurements are collected in fluorescence mode which in general lead to distorted spectra due to absorption effects. Developing a reliable reconstruction algorithm for obtaining undistorted spectra for superficial and in-depth layers is proposed and validated. The developed algorithm calculates the attenuation coefficients of the analyte for the successive layers facilitating a new spectroscopic tool for three-dimensionally resolved nondestructive chemical speciation.
开发了一种新的用于分层系统中化学形态分析的方法，该方法结合了三维微 X 射线荧光光谱（3D Micro-XRF）和传统的 X 射线吸收精细结构光谱（XAFS）。一个重要的应用领域是需要深度分辨化学形态分析的分层材料。测量是在荧光模式下进行的，由于吸收效应，一般会导致光谱变形。提出并验证了一种用于获得表面和深层无失真光谱的可靠重建算法。所开发的算法计算了分析物在连续层中的衰减系数，为三维分辨无损化学形态分析提供了一种新的光谱工具。
