A5081290550- Atomic and Molecular Physics
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Mass Spectrometry Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Inflammatory mediators and NSAID effects
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Spectroscopy and Laser Applications
- Lysosomal Storage Disorders Research
- Ionosphere and magnetosphere dynamics
- Metabolism and Genetic Disorders
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Metal and Thin Film Mechanics
- Eicosanoids and Hypertension Pharmacology
- Laser-Matter Interactions and Applications
- Laser Material Processing Techniques
- Erythrocyte Function and Pathophysiology
- Dust and Plasma Wave Phenomena
- Drug-Induced Hepatotoxicity and Protection
- Plasma Applications and Diagnostics
Ruhr University Bochum
2000-2019
Technical University of Munich
1995
Max Planck Institute of Experimental Medicine
1969-1993
Fraunhofer Institute for Laser Technology
1988-1992
Institute of Spectroscopy
1992
Bielefeld University
1986-1990
GSI Helmholtz Centre for Heavy Ion Research
1990
Joint European Torus
1990
Max Planck Society
1967-1989
National Institute of Standards and Technology
1988
The electrical conductivity of copper has been measured in the range densities 0.3--3 g/${\mathrm{cm}}^{3}$ and temperature from 8 000 to 30 K. Copper wires were vaporized glass capillaries, 1-\ensuremath{\mu}s interval after vaporization began, before tube disintegrated. Measured conductivities are compared with several theoretical models.
The laser-induced vaporization process of a metallic surface is incorporated into simple model which describes the phase transformation and expansion metal vapour against ambient air as function laser intensity material properties. It shown that there exists material-dependent minimal intensity, where properties at front become independent from further gas. This called critical also depends on beam waist front. To check model, comparison with an experimental situation performed, irradiated...
Thin pure aluminum wires which are rapidly vaporized in small glass capillaries by means of a short pulse current from an electrical discharge convert into nonideal plasma near solid density. For period time, the inner wall rigid capillary confines homogeneous until induced pressure disintegrates capillary. During this part discharge, no instabilities occur, and transient covers range parameters according to charge capacitors: particle density ranges 0.001...
Indomethacin given orally or intramuscularly before shortly after induction of acute sodium-taurocholate olive-oil-induced pancreatitis in rats reduced the lethality. Neither enzyme content serum, ascites, and pancreatic tissue nor damage to organ itself were changed under influence indomethacin. Thus a modification systemic effects may be responsible for beneficial effect
Electron collision-excitation rate coefficients have been determined experimentally for excited singlet and triplet ($(n=2,3, \mathrm{and} 4$) levels of the berylliumlike ions N IV, O V, Ne VII, Si IX using various plasma cases produced in a $\ensuremath{\theta}$-pinch device. Line intensities these were measured absolutely converted into by knowledge pertinent parameters. density temperature obtained as function radius time from spectrum scattered laser light. The intercombination...
Abstract Neutron Resonance Spin Echo (NRSE), also called Zero Field Echo, is a spin echo technique that replaces the long high field precession coils of conventional (NSE) (1) with free regions bounded by magnetic resonance flip (2,3). One advantage method it easily adapted to use tilted first proposed F. Mezei for resolution measurement phonon linewidths and R. Pynn (4) elastic small angle scattering. The relatively r-f flipper can be readily through rather large angles.
Collisional-excitation-rate coefficients for sodiumlike Ar viii ions have been obtained theoretically using the Coulomb-Born approximation as well experimentally from absolute intensities of lines emitted by these in well-diagnosed plasmas whose parameters were analysis scattered laser light. These produced a $\ensuremath{\theta}$-pinch device. The agreement between theory and experiment is within estimated accuracy \ifmmode\pm\else\textpm\fi{}50% excitation ground state to $n=3$ $n=4$...
Measurement of plasma electron temperature is based upon the observation decay rate, through ionization, lines from helium-like ions. Ionization ground state supplemented at higher densities by stepwise ionization triplet metastable levels. In an experiment on C v ions in a 15-kJ theta-pinch plasma, this method gives 230 eV ±18%, compared with 240 measured Thomson scattering laser light. addition, measurement intensity ratio resonance to intercombination as function density rate for...
Time-resolved high-resolution soft x-ray spectra from gas-puff injected Ar impurity ions have been investigated for neutral beam heated and ohmically discharges in the TEXTOR tokamak. The experimental show systematic deviations corona model calculations line intensities of forbidden He-like lines x, y, z Li- Be-like dielectronic satellite spectra: theoretical predict significantly too low. High-intensity Li-like inner-shell excited satellites correlate with injection. discrepancies could...
The Stark widths of the $3s\ensuremath{-}3p$ transitions for Li-like ions CIV, NV, and OVI were measured plasma parameters ${n}_{e}=1.8\ifmmode\times\else\texttimes\fi{}{10}^{24}$ ${\mathrm{m}}^{\ensuremath{-}3}$ $k{T}_{e}=12.5$ eV. Within error limits, measurements clearly show a ${Z}^{\ensuremath{-}1}$ dependence width on emitter ionization stage $Z$ ($Z=4$ CIV), whereas calculations within electron-impact approximation yield more nearly proportional to ${Z}^{\ensuremath{-}2}$.
Spectra of the 1s-2p resonance line helium-like argon, Ar XVII, and associated satellites in narrow wavelength range from 3.9494 Å to 3.9944 have been observed at TEXTOR-94 with two high-resolution x-ray crystal spectrometers Bragg angles near 54 degrees. Together, these instruments can be used as an polarimeter. The are very sensitive small amounts argon; thus, a count rate 4 × 105 photons/s, which corresponds maximum capability presently detectors, obtained for argon densities less than...
Measurements of electron density and temperature helium plasmas in a cw running magnetic multipole plasma source by repetitively laser-pulsed 90° Thomson scattering are reported. This is the first experiment which this technique has been applied to such plasmas. performed at gas pressure pg = 5 Pa, discharge voltage was Ud 100 V, current A ≤ Id 30 A, cathode heating 80 Ih 140 A. Electron energy distribution functions obtained from spectra studied. The parameters 1.5 eV kTe 1012 cm−3 ne 4 ×...
Resonance scattering on excited helium atoms is observed by focusing a tunable dye laser at 4471 \AA{} into cold plasma of low degree ionization. Scattering signals due to collisional excitation transfer and radiative decay are many other lines. The magnitude the pulse shape scattered discussed in terms rates; few rates could be deduced.
By focusing simultaneously microwave radiation and the beam from a tunable dye laser into helium plasma, we observe two-photon absorption stimulated Raman scattering on excited atoms. Both effects can be used to measure high-frequency electric fields in plasmas, discuss advantages of this method as compared with standard technique where such are investigated emission spectra.