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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Instrumentation 16

HK 51.2: Vortrag

Donnerstag, 26. März 2015, 15:00–15:15, M/HS2

Chemical shifts of manganese K X-rays — •Malkhaz Jabua — Forschungszentrum Juelich, Juelich, Germany — Georgian Technical University, Tbilisi, Georgia

High resolution X-ray spectroscopy offers a powerful tool to study the complex electron-electron interaction in the atomic shells. Experimentally, this requires an energy resolution below one electron volt, which is achievable only with crystal spectrometers in the few keV range. Crystal spectrometry in this energy range exploits the so called Bragg's law, which measures a wavelength precisely via the diffraction angle. The goal of the experiment held at the institute of nuclear physics at Forschungszentrum Juelich is the measurement of K X-ray energies for various chemical compounds at ultimate precision. The measurements were performed with a Bragg spectrometer set up in Johann geometry. It allows to record simultaneously an energy interval according to the width of the X-ray source when using a correspondingly extended X-ray detector. A series of measurements for various manganese compounds has been completed. X-ray energies were determined to an accuracy of 10-20 meV confirming the known overall behavior of decreasing line energy with increasing ionization state of Mn atom. The talk is focused to describe the setup of the Bragg spectrometer and to present recent results of the comprehensive data analysis.