Dresden 2017 – wissenschaftliches Programm

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MI: Fachverband Mikrosonden

MI 7: Poster: Microanalysis and Microscopy

MI 7.6: Poster

Mittwoch, 22. März 2017, 18:00–20:00, P4

Adaption of conventional CCD cameras for grazing-emission X-ray fluorescence spectroscopy in the laboratory — •Steffen Staeck, Veronika Szwedowski, Jonas Baumann, Ioanna Mantouvalou, and Birgit Kanngießer — TU Berlin

X-ray fluorescence spectroscopy (XRF) is a well-established, non-destructive technique for analyzing the element distribution in a sample. Additional depth information can be gained by introducing an angle variation regarding incident or emitted photons and so changing the information depths. In grazing-incidence and grazing-emission X-ray fluorescence spectroscopy (GI/GEXRF) the angle of the incident beam or the emission angle is varied close to the angle for total reflection. Though these methods have proven to be reliable when analyzing multilayer structures or solar cells, the whole angular range has to be scanned. This can be avoided by using scanning-free GEXRF, where a range of emission angles is recorded simultaneously with a 2D-detector. For this scanning-free approach usually an energy-dispersive pixel camera such as the pnCCD has to be used which is optimized for single-photon counting regarding e.g. read-out noise and sensitivity. As these cameras are high prized, it is of interest to perform such experiments with conventional CCD cameras. In this work we present investigations concerning the understanding of charge cloud formation and transport for the optimization of a conventional CCD camera for GEXRF using laboratory equipment.