3-dimensional Mapping of Chemical States by CT-XAFS Technique with Modified Linear Combination Fitting

Abstract

X-ray absorption fine structure (XAFS) analysis is an important technique that realize to discuss the local structure around a specific element in a sample in atomic scale and to discuss the chemical states of the specific element. Recently, as a developed XAFS measurement, 3d-XAFS (CT-XAFS) measurements are reported, while longer measurement time and increased data volume are problem disturbing the CT-XAFS measurement to be a popular technique. We had reported modified linear-combination-fitting (MLCF) technique is useful to reduce the measurement points and hence to decrease the measurement time and data volume. In this report, the MLCF technique is shortly introduced with a simple example which shows the MLCF technique works well. Then, it is demonstrated that the MLCF technique is successfully applied to obtain the 3d chemical state map of Cu in a tablet from CT data sets obtained at several selected energy points.