title: Data analysis method to achieve sub-10 pm spatial resolution using extended X-ray absorption fine-structure spectroscopy.
abstract: 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 π/2Δk 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.
authors: Institute of Chemical and Engineering Sciences, A*STAR, Singapore 627833, Singapore.
authors: Yonghua
authors: Y
authors: Du
authors: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors: Jia Ou
authors: JO
authors: Wang
authors: Department of Physics, Pennsylvania State University, University Park, PA 16802, USA.
authors: Longhua
authors: L
authors: Jiang
authors: Institute of Chemical and Engineering Sciences, A*STAR, Singapore 627833, Singapore.
authors: Lucas Santiago
authors: LS
authors: Borgna
authors: Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, People's Republic of China.
authors: Yanfei
authors: Y
authors: Wang
authors: Department of Chemistry, National University of Singapore, Singapore 117543, Singapore.
authors: Yi
authors: Y
authors: Zheng
authors: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors: Tiandou
authors: T
authors: Hu
keywords: EXAFS; atom distribution function; spatial resolution