A5034995288- Geological and Geochemical Analysis
- Mass Spectrometry Techniques and Applications
- Organometallic Complex Synthesis and Catalysis
- Asymmetric Hydrogenation and Catalysis
- Photochemistry and Electron Transfer Studies
- Geological Formations and Processes Exploration
- Geochemistry and Geologic Mapping
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- earthquake and tectonic studies
- Metal complexes synthesis and properties
- High-pressure geophysics and materials
- Spectroscopy and Quantum Chemical Studies
- Ion-surface interactions and analysis
- Laser-Matter Interactions and Applications
- Geochemistry and Elemental Analysis
- Inorganic and Organometallic Chemistry
- Synthesis and characterization of novel inorganic/organometallic compounds
- Mineralogy and Gemology Studies
- Paleontology and Stratigraphy of Fossils
- Fullerene Chemistry and Applications
- Molecular Junctions and Nanostructures
- Geotourism and Geoheritage Conservation
- Chemical Reactions and Isotopes
- Chemical Synthesis and Characterization
University of Stuttgart
2003-2023
Philips (Finland)
1990-2004
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1997-2000
CEA Grenoble
1997-2000
University of Siegen
1991-1993
Folkwang University of the Arts
1991-1993
University of Konstanz
1977-1990
Max Planck Society
1985-1987
University of Zurich
1981
Technische Universität Berlin
1975-1980
SummaryLaser flash photolysis of polyuridylic acid (poly U) in anoxic aqueous solutions leads to biphotonic photoionization the uracil moiety followed by formation single strand breaks (ssb). The rate constant for ssb (1·0 s−1, obtained from slow component conductivity increase at 23°C and pH 6·8) increases with decreasing 235 s−1 3·5. activation energy (pre-exponential factor) was measured be 66 kJ mol−1 (5 × 1011 s−1) 6·8. Addition dithiothreitol (DTT) or glutathione (GSH) prevents...
The Malpica–Tuy complex (MTC) in northwestern Spain is a key area for the understanding of geodynamic processes related to early collision Gondwana and Laurussia. To better understand this collisional situation Variscan times, we deciphered mass-flow paths terms pressure (P) temperature (T) five samples (three eclogites, glaucophanite tonalitic gneiss) occurring large eclogite body at 'La Pioza' site central MTC. following three contrasting P–T resulted from application pseudosections,...
An experimental setup is described, which used to multi-ionize neutral clusters and study their stability the importance of different decay processes. Clusters are ionized in collisions with slow multiply charged ions (projectile charge z ranging from 1 30, kinetic energies 20 keV/charge). Both ion cluster beamlines, as well characteristics analysis detection systems, described. Collisions highly such Ar8+ or Xe30+ turn out be efficient tools preparing high states without increasing...
We have studied energy transfer, fragmentation, and ionization in collisions between protons ${\mathrm{C}}_{60}$ molecules. The collision is varied 1 300 keV we thus cover a velocity range from 0.2 to 3.5 atomic units. distributions of intact fragmented ions been measured by means time-of-flight mass spectrometry using pulsed beams or emitted electrons clock the events. processes leading multiple evaporation neutral dimers are analyzed as functions projectile velocity. In contrast recent...
Abstract— Double‐stranded (ds) calf thymus DNA (0.4 mM), excited by 20 ns laser pulses at 248 nm, was studied in deoxygenated aqueous solution room temperature and pH 6.7 the presence of a sodium salt (10 mM). The quantum yields for formation hydrated electrons (Φ e .), single‐strand breaks ssb ) double‐strand dsb were determined various pulse intensities (I 1 ). Φ c . increase linearly with increasing I L ; however, has tendency to reach saturation high (Φ5 times 10 0 Wcm −2 ratio Phi; ssh...
Ru3(CO)12 reagiert mit Tri-tert-butylphosphan und Ameisensäure. Essigsäure, Propionsäure, Buttersäure oder Stearinsäure unter Bildung von Di-μ-(carboxylato)-bis[dicarbonyl(tri-tert-butylphosphan)ruthenium(I)](Ru – Ru). Die IR- NMR-spektroskopischen Daten der neuen Komplexe werden diskutiert. Di-μ-(carboxylato)-bis[dicarbonyl(tri-tert-butylphosphane)ruthenium(I)](Ru Ru) reacts with tri-tert-butylphosphane and formic acid, acetic propionic butyric or stearic acid to form...
Abstract Multiphoton ionization of ferrocene and vanadocene upon nanosecond laser excitation at 351 nm is reported in comparison with results 248 193 nm. A similar behaviour was found for both compounds each wavelength. The fragmentation mechanism elucidated by the determination number absorbed photons ion formation analysis metastable decay. On biphotonic extensive neutral parent molecule to metal atoms observed, followed these after absorption two further photons. In contrast, molecular...