Instrumentation and Analysis Software Development for X-Ray Microfluorescence Experiments at the 4B Beamline of Pohang Light Source-II

The 4B beamline of the Pohang Light Source-II performs X-ray microfluorescence experiments together with X-ray microdiffraction experiments, which was upgraded from the old operating conditions of 2.5 GeV and 200 mA to 3.0 GeV and 400 mA. The X-ray microbeam for the microfluorescence experiments is focused to a FWHM size of about 2 μm by adjusting a Kirkpatrick-Baez (KB) mirror system through a LabVIEW application for automatic beam focusing, in the same manner as in the X-ray microdiffraction experiments. A fluorescence detector collects X-ray fluorescence spectra with high-spatial resolution by two-dimensionally scanning a sample attached on an XYZ motorized stage about the focused microbeam. The scanning process is also performed by a LabVIEW application and the collected fluorescence spectra are saved in text format. A microfluorescence analysis software has been newly developed to obtain two-dimensional maps of elements composing a sample from fluorescence spectra. This paper introduces the instrumentation for X-ray microfluorescence experiments at the 4B beamline, describes the details of the developed microfluorescence analysis software, and reports its first analysis results