A5023066762- Atomic and Molecular Physics
- Electronic and Structural Properties of Oxides
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Surface and Thin Film Phenomena
- Catalytic Processes in Materials Science
- ZnO doping and properties
- Force Microscopy Techniques and Applications
- Molecular Junctions and Nanostructures
- Gas Sensing Nanomaterials and Sensors
- Semiconductor materials and devices
- Catalysis and Oxidation Reactions
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Transition Metal Oxide Nanomaterials
- Advanced Condensed Matter Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Laser-induced spectroscopy and plasma
- Copper-based nanomaterials and applications
- nanoparticles nucleation surface interactions
- Electron and X-Ray Spectroscopy Techniques
- Magnetic and transport properties of perovskites and related materials
- Lanthanide and Transition Metal Complexes
- Magnetic properties of thin films
- Porphyrin and Phthalocyanine Chemistry
TU Wien
2014-2023
Central European Institute of Technology
2020-2022
Brno University of Technology
2020-2022
Friedrich-Alexander-Universität Erlangen-Nürnberg
1999-2020
Austrian Economics Center
2017
University of Graz
2008-2015
Ferdinand-Braun-Institut
2010
Kirchhoff (Germany)
2010
Max Planck Society
1997-1998
Max Planck Institute for Polymer Research
1995
State-resolved cross sections for the dielectronic recombination of hydrogenlike oxygen ions with free electrons have been measured first time using electron cooling device in heavy-ion Test Storage Ring Heidelberg. Energies and individual terms configuration 2l2l' were determined. Two-electron resonances 2lnl' n\ensuremath{\ge}3 contribute 90% to total dielectronic-recombination section. are reasonable agreement available calculations.
The adsorption of Ni, Co, Mn, Ti, and Zr at the $(\sqrt{2}\ifmmode\times\else\texttimes\fi{}\sqrt{2})\text{R}{45}^{\ensuremath{\circ}}$-reconstructed ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}(001)$ surface was studied by scanning tunneling microscopy, x-ray ultraviolet photoelectron spectroscopy, low-energy electron diffraction (LEED), density functional theory (DFT). Following deposition room temperature, metals are either adsorbed as isolated adatoms or fill subsurface cation vacancy sites...
Significance Molecular <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mtext>O</mml:mtext> </mml:mrow> <mml:mn>2</mml:mn> </mml:msub> </mml:math> on semiconducting metal oxides, its adsorption, response to thermal treatment, UV irradiation, and electron/hole injection is at the heart of a wide range technologies. These processes were studied molecule by prototypical model oxide <mml:mi mathvariant="normal">T</mml:mi>...
Electron-impact ionization cross sections for He-like ${\mathrm{Li}}^{+}$ ions have been measured with extreme precision (0.01% statistics). Thus, two new mechanisms in the of positive both involving two-electron excitations could be quantitatively investigated. We see (1) direct excitation K electrons into L shell subsequent autoionization and (2) resonant capture incident electron by ion correlated KK-LL core leading to a triply excited Li atom which then decays emission electrons. Strong...
Metal tungstates (with general formula MWO4) are functional materials with a high potential for diverse set of applications ranging from low-dimensional magnetism to chemical sensing and photoelectrocatalytic water oxidation. For level applications, nanoscale control film growth is necessary, as well deeper understanding characterization properties at reduced dimensionality. We succeeded in fabricating characterizing two-dimensional (2-D) copper tungstate (CuWO4). the first time, atomic...
We report the first measurements on radiative and dielectronic recombination (RR DR) of very highly charged ions at energies ${\mathit{E}}_{\mathrm{cm}}$ as low 0 to 50 eV. Novel techniques were employed heavy-ion storage ring ESR obtain absolute rates ${\mathrm{Au}}^{76+}$(1${\mathit{s}}^{2}$2s). The increase RR rate for ${\mathit{E}}_{\mathrm{cm}}$\ensuremath{\rightarrow}0 could be recorded single DR resonances in...
Changes in chemical and physical properties resulting from water adsorption play an important role the characterization performance of device-relevant materials. Studies model oxides with well-characterized surfaces can provide detailed information that is vital for a general understanding water-oxide interactions. In this work, we study single crystals indium oxide, prototypical transparent contact material heavily used wide range applications most prominently optoelectronic technologies....
In$_2$O$_3$-based catalysts have shown high activity and selectivity for CO$_2$ hydrogenation to methanol, however the origin of performance In$_2$O$_3$ is still unclear. To elucidate initial steps over In$_2$O$_3$, we combined X-ray Photoelectron Spectroscopy (XPS) Density Functional Theory (DFT) calculations study adsorption on In$_2$O$_3$(111) crystalline surface with different terminations, namely stoichiometric, reduced, hydroxylated surface, respectively. The approach confirms that...
Ionic liquids (ILs) are used as ultrathin films in many applications. We studied the nanoscale arrangement within first layer of 1,3-dimethylimidazolium bis[(trifluoromethyl)sulfonyl]imide ([C1C1Im] [Tf2N]) on Au(111) between 400 and 110 K ultrahigh vacuum by scanning tunneling noncontact atomic force microscopy with molecular resolution. Compared to earlier studies similar ILs, a different behavior is observed, which we attribute small size symmetrical shape cation: (a) In both AFM STM only...
Clean oxide surfaces are generally hydrophilic. Water molecules anchor at undercoordinated surface metal atoms that act as Lewis-acid sites, and they stabilized by H bonds to oxygens. The large unit cell of In2O3(111) provides in various configurations, which leads chemical heterogeneity a local deviation from this general rule. Experiments (TPD, XPS, ncAFM) agree quantitatively with DFT calculations show series distinct phases. first three water dissociate one specific area the desorb above...
This paper reports first experimental data on radiative recombination of ions with free electrons and discusses a measurement rates U28+ which appears to contradict known theories.
When the In2O3 surface is subjected to reducing conditions it responds with formation of an ordered array isolated In adatoms. The facile back-and-forth between oxidized and reduced should allow tuning properties in a judicious clear-cut manner. On more fundamental level, adatom structure entirely novel way any oxide respond conditions. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for...
Isolated, nanoscale (5.0--20.0 nm diameter) Cu clusters on a reduced ${\mathrm{TiO}}_{2}$ (110) surface exhibit the initiation of Schottky effect. Apparent height changes isolated occur in scanning tunneling microscopy imaging as bias conditions are changed. This apparent change is directly related to current flow through cluster-oxide interface barrier. Further, depletion zones along substrate adjacent same dependence indicating that associated with local band-bending, analogous macroscopic...
(WO3)3 gas-phase clusters generated via vacuum sublimation are deposited under UHV and low temperature (<15 K) conditions on a Cu(110) stripe phase consisting of alternating Cu-O (2 × 1) clean Cu regions. STM imaging shows that the adsorb as intact units both substrates, suggested adsorption geometries confirmed by density-functional (DF) simulations. On surface, overall distortion is minor, we able to image nodal structure an individual molecular orbital in at bias, whereas surface...
Cross sections for mutual neutralisation in H+-H- collisions have been measured the CM energy range 1-40 keV, using crossed beams and coincident detection of reaction products. The results extend smoothly latest measurements by Peart et al. (1985) Szucs (1984) towards higher energies they are partly excellent accord with recent theoretical predictions.
The relative triple differential cross section for electron impact ionization of helium has been measured in the coplanar symmetric geometry at an energy 200 eV. A deep minimum near Theta =85' is least a factor 2.7*10-4 smaller than peak =40'. These results diverge markedly from previous measurements and second Born calculations by Pochat et al. (1983) but are good agreement with distorted-wave calculation Zhang, Whelan Walters (1990). Four theoretical discussed.
The growth and oxidation of Ni nanostructures on stepped Rh(15 15 13) (553) surfaces, both vicinals Rh(111), have been studied by scanning tunneling microscopy (STM), LEED, core level spectroscopies with use synchrotron radiation (XPS NEXAFS), work function measurements. At low coverages, quasi-one-dimensional rows decorate the Rh step edges. With increasing adlayers grow layer-by-layer in a restricted step-flow mode, pseudomorphically up to ∼2 monolayer (ML). Relaxation bulk lattice occurs...