TY - CHAP A1 - Schmeißer, Dieter A1 - Müller, Sebastian A1 - Henkel, Karsten A1 - Müller, Klaus A1 - Wehner, Stefan T1 - In-situ analysis of moving reaction fronts for the bistable CO oxidation reaction on noble metal catalyst T2 - Extended Abstracts Book of First International Conference on Materials for Energy N2 - Experimental data on the reaction kinetics of catalytic processes are prerequisite for modeling of such reactions and their output. We investigate the CO oxidation on some noble metal catalysts, like Iridium(111) and Palladium(111) which is a bistable surface reaction. In a specific range of CO content in the feed gas islands of one or the other adsorbate nucleate and grow, which is recorded with photo electron emission microscopy (PEEM). During these transients the coverage on the surface changes from predominantly oxygen covered to predominantly CO covered resp. vice versa. But the resolution of PEEM and especially its unknown and nonlinear dependence of coverage of the two adsorbates (oxygen and CO) and image intensity make it impossible to extract the changes in coverage. On the other hand the reaction diffusion model based on the Langmuir-Hinshelwood-mechanism delivers the coverage of oxygen and carbon monoxide. The shapeand wall velocity of those islands has been connected perfectly to each other [CPL 423 (2006) 39], but not the absolute coverage and their variation during the reaction. Since the domain wall velocity is small on Iridium(111), this has opened the possibility for a detailed analysis of the changing coverage inside this domain wallutilizing synchrotron radiation and photo electron spectroscopy at BESSY II. The coverage profile of oxygen and CO inside a moving domain wall was measured for both cases using XPS spectra at O1s, C1s and the valence band during thereaction. Comparison with the reaction-diffusion-model and other catalytic surfaces, like Palladium(111) are done. KW - CO oxidation KW - Ir KW - Pd KW - photo electron emission microscopy (PEEM) Y1 - 2010 SN - 978-3-89746-117-8 SP - S. 932 PB - Dechema e.V. CY - Frankfurt ER - TY - JOUR A1 - Müller, Sebastian A1 - Seibold, Götz A1 - Schmeißer, Dieter ED - Vierhaus, Heinrich Theodor T1 - Preparation and Characterization of TiO2 Thin Films and Cr and Co Doped TiO2 Thin Films Y1 - 2007 ER - TY - JOUR A1 - Schmeißer, Dieter A1 - Domaradzki, Jarosław A1 - Kaczmarek, Danuta A1 - Borkowska, Angnieszka A1 - Müller, Sebastian T1 - Influence of Annealing on the Structure and Stoichiometry of Europium-Doped Titanium Dioxide Thin Films Y1 - 2008 ER - TY - CHAP A1 - Müller, Sebastian A1 - Schmeißer, Dieter T1 - Synchrotron radiation spectroscopy studies of ultrathin chromium films on titanium dioxide T2 - International Students and Young Scientists Workshop "Photonics and Microsystems", 2009, 25 - 27 June 2009, Harz University, Wernigerode, Germany KW - synchrotron KW - radiation KW - spectroscopy KW - ultrathin KW - titanium KW - chromium Y1 - 2009 SN - 978-1-4244-4303-1 SP - 64 EP - 68 PB - IEEE CY - Piscataway, NJ ER - TY - JOUR A1 - Müller, Sebastian A1 - Schmeißer, Dieter T1 - Properties of Cr deposited on TiO2 thin films KW - cr KW - TiO2 Y1 - 2008 ER - TY - CHAP A1 - Müller, Sebastian A1 - Schölzel, Mario T1 - Combining Hardware and Software Based Self Repair Methods for Statically Scheduled Data Paths T2 - 2010 IEEE 25th International Symposium on Defect and Fault Tolerance in VLSI Systems (DFT 2010), Kyoto, Japan, 6 - 8 October 2010 KW - Prozessoren KW - Zuverlässigkeit KW - Selbstreparatur Y1 - 2010 SN - 978-1-424-48447-8 N1 - IEEE Computer Society SP - 90 EP - 98 PB - IEEE CY - Piscataway, NJ ER - TY - CHAP A1 - Müller, Sebastian A1 - Schölzel, Mario A1 - Vierhaus, Heinrich Theodor T1 - Hierarchical Self-repair in Heterogenous Multi-core Systems by Means of a Software-based Reconfiguration T2 - VEFRE 8th Workshop on Dependability and Fault-Tolerance, Proceedings of ARCS 2012 Workshops Y1 - 2012 SN - 978-1-4673-1913-3 PB - IEEE CY - Piscataway ER - TY - CHAP A1 - Müller, Sebastian A1 - Schölzel, Mario A1 - Vierhaus, Heinrich Theodor T1 - Towards a Graceful Degradable Multicore-System by hierarchical Handling of Hard Errors T2 - DaRMuS 2013, Special Session on Dynamic and Reliable Multicore Systems, Hosted by 21st Euromicro PDP Conference Y1 - 2013 SN - 978-146-735-321-2 SP - 302 EP - 309 PB - IEEE CY - Piscataway ER - TY - THES A1 - Müller, Sebastian T1 - Synchrotron radiation spectroscopy studies of the initial interaction of Chromium and Cobalt with the surface of Titanium Dioxide N2 - In the framework of this thesis, synchrotron radiation based spectroscopy methods are applied to study the electronic structures of stoichiometric Rutile single crystals and TiO2 thin films, and the initial stage of chromium and cobalt growth on TiO2 thin films. Resonance photoemission spectroscopy of clean TiO2 at the Ti L2,3 edges led to Auger-like features, with kinetic energies corresponding to the Ti L2,3M4,5M4,5 Auger decay channels. The presence of these features is assigned to origin from a d2L2 charge transfer state. The resonance of the Ti L3M2,3V Auger channel at the Ti L2 edge is assigned to the L2L3V Coster-Kronig Auger, followed by the normal L3M2,3V Auger decay. The deposition of chromium on the TiO2 film causes a strong interaction at the interface, in which TiO(2-x) is formed together with chromium in the Cr 3+ state. Besides the oxidized component, contribution of metallic chromium is found as well. In the ultra-low coverage regime, post-deposition oxidation is observed, in which metallic chromium is oxidized to Cr2O3, accompanied by re-oxidation of the substrate to TiO2. The interface reaction is also reflected by the appearance of two defect states in the band gap. Resonant photo-emission at the Cr 2p and Ti 2p edges shows well distinguishable Cr 3d respectively Ti 3d character of the respective states. Indications for self-cleaning properties are found by removal of surface carbon during storage in UHV, but the influence of chromium on these properties is not studied in detail. The interaction between cobalt and TiO2 is weaker than that of chromium and TiO2. Nevertheless, an interface reaction is found, in which some of the deposited cobalt is oxidized, while the oxide support is partly reduced. The particular oxidation state of Cobalt is identified by means of multiplet calculation including charge transfer and crystal field effects. The calculated XAS and XPS spectra indicate Co 2+ in a tetrahedral coordination with four oxygen atoms. The metallic component of cobalt gives rise to a broad resonance in the valence band down to -20 eV, with a pronounced satellite feature that reflects the oxidized component. KW - Titanium dioxide KW - Metal/metal-oxide interaction KW - Multiplet-calculation KW - Resonant photoemission Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-18914 UR - http://opus.kobv.de/btu/volltexte/2010/1891/ ER - TY - CHAP A1 - Müller, Sebastian A1 - Koal, Tobias A1 - Schölzel, Mario A1 - Vierhaus, Heinrich Theodor T1 - Timing for Virtual TMR in Logic Circuits T2 - IOLTS 2014, 20th IEEE International On-Line Testing Symposium Hotel Cap Roig, Platja d'Aro, Catalunya, Spain July 7-9, 2014 Y1 - 2014 SN - 978-1-4799-5324-0 ER -