Du, Y. H.; Wang, J.-O.; Jiang, L. H.; Borgna, L. S.; Wang, Y. F.; Zheng, Y.; Hu, T. D., Data analysis method to achieve sub-10 pm spatial resolution using extended X-ray absorption fine-structure spectroscopy. Journal of Synchrotron Radiation 2014, 21, (4), [DOI: 10.1107/S1600577514010406].
Obtaining sub-10 pm spatial resolution by extended X-ray absorption fine structure (EXAFS) spectroscopy is required in many important fields of research, such as lattice distortion studies in colossal magnetic resistance materials, high-temperature superconductivity materials etc. However, based on the existing EXAFS data analysis methods, EXAFS has a spatial resolution limit of [pi]/2[Delta]k which is larger than 0.1 Å. In this paper a new data analysis method which can easily achieve sub-10 pm resolution is introduced. Theoretically, the resolution limit of the method is three times better than that normally available. The method is examined by numerical simulation and experimental data. As a demonstration, the LaFe1-xCrxO3 system (x = 0, 1/3, 2/3) is studied and the structural information of FeO6 octahedral distortion as a function of Cr doping is resolved directly from EXAFS, where a resolution better than 0.074 Å is achieved.