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O: Fachverband Oberflächenphysik
O 48: Poster Session - Electronic Structure of Surfaces: Spectroscopy, Surface States
O 48.3: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Capability of an ultra-low work function electride material for ion thrusters as neutralizer insert — Fabian Michel1,2, Daniel Zschaetsch1,2, Malina Reitemeyer1,2, •Jurek Lange1,2, Limei Chen1,2, Detlev M. Hofmann1,2, and Peter J. Klar1,2 — 1Institue of Experimental Physics I, JLU Giessen, 35392 Giessen — 2Center for Material Research (ZfM/LaMa), JLU Giessen, 35392 Giessen
Due to its low workfunction for electrons electride materials have many advantages for applications for space flight propulsions. For this reason C12A7:e− is a promising insert candidate to be used in cold-cathode designs. By tuning the reduction process of C12A7 (12 CaO-7 Al2O3) it is possible to achieve electron concentrations up to 1021/cm3. The concentrations can be determined by electrical measurements, and complementary by electron paramagnetic resonance (EPR) and Raman spectroscopy. In addition the later give information about impurities in the material. We further correlate the EPR and Raman results to photoelectron spectroscopy (XPS), to obtain a deeper understanding of the material properties. The task of the investigation is to contribute to the improvement of charge neutralizer materials for space applications.