Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 118: Metal substrates: Structure, epitaxy and growth
O 118.5: Vortrag
Freitag, 16. März 2018, 12:00–12:15, MA 005
X-ray standing wave excited photoemission experiments on W/C multilayer mirrors — •Marie Schmitz1, Philipp Espeter1, Ronja Anika Heinen2, Patrick Lömker2, Andrei Gloskovskii3, Wolfgang Drube3, Martina Müller2, and Carsten Westphal1 — 1Experimentelle Physik 1 - Technische Universität Dortmund, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany — 2Forschungszentrum Jülich GmbH, PGI-6, Jülich, Germany — 3Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
The method of photoelectron spectroscopy provides a high chemical sensitivity thus being element sensitive, without giving a spacial resolution. In contrast, x-ray reflection methods can provide this depth-resolution, without being element specific. The stated disadvantages can be overcome by using XSW-measurements as they both provide the advantages of these methods. In order to this, a thin periodic layer system of alternating refractive index materials has to be used to generate a strong standing wave while rocking the sample around the bragg-angle. The multilayer including Si and Mo is a widely used system to generate standing waves on a surface. We use a bilayer system of alternating Carbon and Tungsten (W/C), as it provides better temperature-stabilities, while keeping a high reflectance. In this context the reflectivity is an important figure of merit. The smoothness of the interface is a key property leading to a perfect interface without boundary imperfections. We report on the measurements of x-ray standing waves (XSW) generated on a W/C multilayer system. A Pd cap was used as a test system.