A5102891830- Advanced Chemical Physics Studies
- Molecular Junctions and Nanostructures
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Atomic and Molecular Physics
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Catalytic Processes in Materials Science
- Photochemistry and Electron Transfer Studies
- Catalysis and Oxidation Reactions
- Radiative Heat Transfer Studies
- Inorganic Chemistry and Materials
- Machine Learning in Bioinformatics
- Geotechnical and Geomechanical Engineering
- Advanced Electron Microscopy Techniques and Applications
- Advanced Condensed Matter Physics
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Metabolomics and Mass Spectrometry Studies
- Rare-earth and actinide compounds
- Laser-Matter Interactions and Applications
- Bioinformatics and Genomic Networks
- Advanced Proteomics Techniques and Applications
- nanoparticles nucleation surface interactions
- Advanced battery technologies research
Paul Scherrer Institute
2015-2020
ETH Zurich
2010-2020
University of Stuttgart
2019
Norsk Hydro (Germany)
2016
University of Konstanz
2014
University of Regensburg
1996-2000
Abstract OLED technology beyond small or expensive devices requires light-emitters, luminophores, based on earth-abundant elements. Understanding and experimental verification of charge transfer in luminophores are needed for this development. An organometallic multicore Cu complex comprising Cu–C Cu–P bonds represents an underexplored type luminophore. To investigate the structural rearrangements material, we apply complementary pump-probe X-ray techniques: absorption, emission, scattering...
Abstract
The extension of transient grating spectroscopy to the x-ray regime will create numerous opportunities, ranging from study thermal transport in ballistic charge, spin, and energy transfer processes with atomic spatial femtosecond temporal resolution. Studies involving complicated split-and-delay lines have not yet been successful achieving this goal. Here we propose a novel, simple method based on Talbot effect for converging beams, which can easily be implemented at current free electron...
The first high-spin transition in C2 (1 (5)Πu - 1 (5)Πg) is observed by perturbation-facilitated optical-optical double resonance spectroscopy. experiment performed applying unfolded two-color resonant four-wave mixing. radicals the initial a (3)Πu, v = 5 state are produced using discharge source molecular beam environment. final quintet excited via intermediate "gateway" states exhibiting both substantial triplet and character due to perturbation between (5)Πg, 0 d (3)Πg, 6 states. Fifty...
Size-selected gold clusters on titania present highly efficient solution phase catalysts for bromination with NBS reaching TONs of enzymes.
The injection of fluids into the subsurface takes place in context a variety engineering applications such as geothermal power generation, disposal wastewater, $$\hbox {CO}_{2}$$ storage and enhanced oil recovery. These technologies involve not only underground emplacement geologic formation but also affect stress state these rocks. If rock's strength is surpassed, changes can even lead to failure. In this context, we present conceptual approach model fault reactivation porous media. As...
The dissociation energy in the X1Σg+ electronic ground state of carbon dimer C2 is determined spectroscopically from a combined treatment involving resonant four-wave mixing experiments and highly accurate multi-reference configuration interaction calculations to be (50370±150)hccm−1 ((6.24±0.02) eV, (602±2) kJ mol−1). This new value allows us clarify current discrepancies among other experimental theoretical results, which will discussed.
Vibrational levels of the recently observed high-spin transition (1 Πu5−1 Πg5) dicarbon [P. Bornhauser et al., J. Chem. Phys. 142, 094313 (2015)] are explored by applying non-linear double-resonant four-wave mixing and laser-induced fluorescence methods. The deperturbation d Πg3, υ = 8 1 Πg5, 3 states results in accurate molecular constants for “dark” quintet state. In addition, spin-orbit interaction constant is determined parameters upper Swan level improved. first excited vibrational...
The potential of two‐color resonant and degenerate four‐wave mixing spectroscopy for investigations the complex spectra transition metal dimers is explored. Two‐color scans well‐known A‐X B‐X transitions in Cu 2 are reported compared with previous experimental data obtained from standard single‐resonance techniques. selectivity method shown to enable measurement isotopologue pure without need isotopically enriched targets. Specific subsets rovibronic structure separated a congested spectral...
A new Stern–Gerlach setup elucidates the spin relaxation dynamics of small weakly-bound Na(NH<sub>3</sub>)<sub>n</sub> clusters.
Perturbation facilitated double-resonant four-wave mixing is applied to access high-lying vibrational levels of the X 1Σg+ (0g+) ground state Cu2. Rotationally resolved transitions up v″ = 102 are measured. The highest observed level at 98% dissociation energy. range and accuracy previous measurements significantly extended. By applying near equation developed by Le Roy [R. J. Roy, Quant. Spectrosc. Radiat. Transfer 186, 197 (2017)], a energy De 16 270(7) hc cm−1 determined, an accurate...
A new size-selected cluster deposition technique referred to as "parallel-deposition" is presented. An ion beam of multi-sized Aun clusters was spatially separated into individual sizes by utilizing a Wien filter and the based on their atomic were simultaneously deposited SiO2/Si(100) substrate. Parallel-deposited (n = 6, 7, 8) substrate showed even-odd oxidation behaviour upon exposure an oxygen atmosphere, demonstrating potential this study size-dependent properties in various research fields.
The low energy electronic structure of the copper dimer has been re-investigated using non-linear four-wave mixing spectroscopy and high level ab initio calculations. In addition to measurement previously reported A, B, C states, a new state denoted A' is identified with T0 = 20 100.4090(16) cm-1 (63Cu2). Rotational analysis A'-X (0,0) (1,0) transitions leads assignment 1u. Ab calculations present first theoretical description states in Hund's case (c) confirm experimental assignment....
Abstract Transition metals, characterised by their partially filled d orbitals, provide the basis for many of most relevant processes in chemistry, biology, and physics. Embedded as single atoms or small clusters, they give rise to exceptional optical, chemical, magnetic properties. So far, it has proven impossible disentangle complex network excited quantum states, which greatly hinders prediction control material Here, we apply two-colour resonant four-wave mixing quantitatively resolve...
The available knowledge of the electronically excited states copper dimer is limited. This common for transition metals, as high density hinders both experimental assignment and computation. In this work, two-color resonant four-wave mixing spectroscopy was applied to neutral Cu2 in gas phase. method yielded accurate positions individual rovibrational lines I-X J-X electronic systems. revealed term symbols I J 1Πu (1u) 1Σu+ (0u+), respectively. For 63Cu2 isotopologue, molecular constants...
Abstract. Predicting shear failure that leads to the reactivation of faults during injection fluids in subsurface is difficult since it inherently involves an enormous complexity flow processes interacting with geomechanics. However, understanding and predicting induced seismicity great importance. Various approaches modelling have been suggested recently. They are all dependent on prediction pressure stress field, which requires solution partial differential equations for Given a...