A5006576151- Advanced Chemical Physics Studies
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- Spectroscopy and Quantum Chemical Studies
- Molecular Junctions and Nanostructures
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Surface and Thin Film Phenomena
- Mass Spectrometry Techniques and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Quantum and electron transport phenomena
- Surface Chemistry and Catalysis
- Advanced Materials Characterization Techniques
- Semiconductor materials and devices
- Catalysis and Oxidation Reactions
- Physics of Superconductivity and Magnetism
- Spectroscopy and Laser Applications
- Theoretical and Computational Physics
- Electrochemical Analysis and Applications
- Magnetic properties of thin films
- Electrocatalysts for Energy Conversion
- Fusion materials and technologies
Fritz Haber Institute of the Max Planck Society
2012-2024
Technical University of Munich
2013-2024
Université de Sherbrooke
2007
Rutgers, The State University of New Jersey
2007
Elettra-Sincrotrone Trieste S.C.p.A.
2001
University of Alberta
1987-1998
Forschungszentrum Jülich
1995
University of Chicago
1964-1992
University of Basel
1992
University of California, Irvine
1992
The effect of low-energy (15–200-eV) electrons on hydrogen, oxygen, carbon monoxide, and barium adsorbed tungsten has been investigated by a field-emission technique. Desorption cross sections σ were determined from work function Fowler—Nordheim pre-exponential changes are significantly smaller than would be expected for comparable molecular processes. Marked variations in section with binding mode within given system found. Thus σH=3.5 10—20 cm2 5×10—21 processes tentatively interpreted as...
A variety of methods [temperature programmed desorption via pressure rise and work function changes (Δφ); isothermal Δφ: quasiequilibrium measurements isobars monitored by Δφ, in combination with sticking coefficients] has been used to obtain detailed data on the coverage dependence adsorption equilibrium kinetics for CO basal Ru(001) face. While deviation from reversibility varies strongly over these methods, no significant influence degree irreversibility results found. Desorption energies...
Direct evidence for the effect of local strain at a surface on bonding strength adsorbates is presented. Scanning tunneling microscopy revealed that adsorbed oxygen atoms Ru(0001) surfaces are located preferentially top nanometer-size protrusions above subsurface argon bubbles, where tensile prevails, and depleted around their rim in regions compression, relative to flat surface. Such effects can be considered as reverse adsorbate-induced strain, direct demonstration used test theoretical...
Flash desorption measurements from single crystal surfaces may be improved by following work function changes rather than parameters such as pressure.(AIP)
Near-edge x-ray-absorption fine-structure spectroscopy studies are used to determine changes in the electronic, geometric, and magnetic structure of two sequential molecular precursors ${\mathrm{O}}_{2}$ on Pt(111). Both molecules lie down surface. Physisorbed is found be van der Waals bonded, structurally unperturbed paramagnetic, while chemisorbed \ensuremath{\pi} stretched by 0.16 \AA{}, exhibits a reduced or vanishing paramagnetic exchange splitting.
After careful calibration, the work function change induced by CO adsorption on Ru(001) has been used to measure sticking coefficient s as functions of sample temperature (between 100 and 400 K) coverage, with gas always at about 295 K. The main results are: At θ=0, is independent between K, s0=0.7 for 0<θ<0.2. drops proportional (1–θ) Ts≳200 more gradually below 200 K; slowly up θ=0.5. Above θ=0.23 a sharp decrease sets in Ts≳120 second plateau becomes obvious around θ∼0.35...
It is shown conclusively that electron impact ionization of the C $1s$ and O core levels CO adsorbed on W(100) leads to C${\mathrm{O}}^{+}$ ${\mathrm{O}}^{+}$ desorption, respectively, soft-x-ray photons induce same processes by an intrinsic photoeffect. Disintegration adsorption complex which becomes multiply charged Auger decay hole assumed as explanation.
We report on laser-assisted attosecond photoemission from single-crystalline magnesium. In strong contrast to the previously investigated transition metal tungsten, photoelectron wave packets originating localized core level and delocalized valence-band states are launched simultaneously solid within experimental uncertainty of 20 as. This phenomenon is shown be compatible with a heuristic model based free-particle-like propagation electron generated inside crystal by excitation pulse their...