Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 22: Interaction with VUV and X-ray light

A 22.4: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

Transition probabilities of the titanium L3 fluorescence lines as a function of the oxidation state — •Rainer Unterumsberger, Matthias Müller, and Burkhard Beckhoff — Physikalisch-Technische Bundesanstalt, Abbestrasse 2-12, 10587 Berlin, Deutschland

The increase of the sensitivity of a wavelength-dispersive spectrometer (WDS) [1] in the soft X-ray range enables the access to high resolved X-ray emission spectrometry at nanoscaled materials like lights elements and transition metals. The increase could be achieved by focusing of the incident undulator radiation using a single bounce monocapillary [2]. The spectrometer was well characterized and the response behavior was experimentally determined. Due to the knowledge of the response function of the spectrometer, a reliable deconvolution of the emission spectra is possible. That enables the determination of the fluorescence intensity of each emission line with low uncertainties. Here, the relative intensity was estimated to 15 %. The transition probabilities of the titanium L3 fluorescence lines were determined as a function of the oxidation state. The measurements were carried out at the plane-grating monochromator (PGM) beamline in the PTB laboratory at BESSY II using monochromatized undulator radiation and calibrated instrumentation [3,4].

[1] R. Unterumsberger et al., Spectrochim. Acta B 78 (2012) 37-41

[2] M. Müller et al., Phys. Rev. A 79, 032503 (2009)

[3] B. Beckhoff et al., Anal. Chem. 79, 7873 (2007)

[4] B. Beckhoff, J. Anal. At. Spectrom. 23, 845 (2008)