A5075047763- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Mass Spectrometry Techniques and Applications
- Ion-surface interactions and analysis
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Laser-induced spectroscopy and plasma
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Laser-Matter Interactions and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Crystallography and Radiation Phenomena
- Radioactive Decay and Measurement Techniques
- Plasma Diagnostics and Applications
- High-Energy Particle Collisions Research
- Radiation Shielding Materials Analysis
- Advanced Frequency and Time Standards
- Nanopore and Nanochannel Transport Studies
- Radiation Therapy and Dosimetry
- Muon and positron interactions and applications
- Scientific Measurement and Uncertainty Evaluation
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Astrophysics and Star Formation Studies
Stockholm University
2015-2024
AlbaNova
2014-2024
Physikalisch-Technische Bundesanstalt
2023
Technische Universität Braunschweig
2023
GSI Helmholtz Centre for Heavy Ion Research
2011-2020
Helmholtz Institute Jena
2011-2020
Goethe University Frankfurt
1976-2011
Heidelberg University
1983-2011
Helmholtz-Zentrum Dresden-Rossendorf
2011
Frankfurt Institute for Advanced Studies
2011
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.
We report a narrow angular distribution of 0.8\ifmmode^\circ\else\textdegree\fi{}, close to that expected from the aspect ratio, for guiding highly charged ions through well-ordered, parallel $\mathrm{Si}{\mathrm{O}}_{2}$ nanocapillaries target. These capillaries were obtained by thermally oxidizing $25\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick membrane silicon fabricated photoassisted electrochemical etching. The diameter uniformly distributed was...
We investigated the time evolution of dynamically shifting distribution 7 keV ${\mathrm{Ne}}^{7+}$ ions guided through nanocapillaries in ${\mathrm{SiO}}_{2}$. present evidence for a small number charge patches, formed sequentially charging-up process, guiding ions. show that patches are distributed along whole length capillaries and they maintained equilibrium state transmission. The interpretations supported by model calculations.
We present measurements of the angular distribution fast hydrogen atoms formed by electron capture 2.8- and 5.0-MeV protons in atomic hydrogen. In region Thomas peak (0.47 mrad) experimental results obtained with this pure three-body collision system are reasonable agreement a strong-potential Born calculation impulse approximation, but not other higher-order theories.
The first observation of laser-induced recombination, performed with merged beams protons, electrons, and laser photons in an ion storage ring, is reported. process was used to study the photorecombination spectrum high resolution. Deviations from earlier theoretical predictions turned out be due a weak external electric field could well described by simple extension field-free quantum-mechanical theory, based on properties classical electron trajectories combined Coulomb fields.
${\mathrm{Xe}}^{\mathit{q}+}$ ions with charge up to q=33 and energies 3.7q keV are scattered under a grazing angle of incidence from clean flat Al(111) surface. Because the image interaction accelerated on incident path towards surface plane which results in increased effective angles for projectiles. From angular distributions reflected neutralized projectiles we deduce gained by front Our data fair agreement ${\mathit{q}}^{3/2}$ dependence as predicted simple classical overbarrier model.
Experimental cross sections are reported for electron capture and transfer ionization Ne, Ar, Kr, Xe projectiles on He charge states ($q$) between 2 13 projectile energies $(250 \mathrm{and} 1000 \mathrm{eV})q$. The double-electron is found to be typically an order of magnitude weaker than single-electron capture, dominated in most cases by the channel. While gross features can qualitatively understood, quantitative agreement with available theoretical model calculations poor.
The excitation probability of the $1s\ensuremath{\sigma}$-molecular orbital has been measured as a function impact parameter $b$ for several collision systems in region $129<~{Z}_{1}+{Z}_{2}<~178$ at UNILAC. All published impact-parameter data agree with simple scaling law except those parameters $b<~40$ fm Pb+Cm system (${Z}_{1}+{Z}_{2}=178$).
We have investigated the nonlinear optical properties of indium tin oxide (ITO) thin film coated on soda–lime glass substrate using z-scan technique. With 100 fs laser pulses, absorption coefficient and refractive index are measured at different excitation wavelengths incident intensities. The shows a competition between saturable reverse A transition from to was observed with increasing wavelengths. found be dependent wavelength maximum value <mml:math...
The study of low-energy, high-charge-state ions traversing insulating nanochannels has focused on the guiding effects due to deposition charge, while experimental and theoretical research influence image charge forces caused by polarization channel walls during ion transmission is relatively scarce. We employed a combination methods conduct experiments 1 keV N<sub>2</sub><sup>+</sup> beams passing through muscovite microporous membranes. Under condition complete...
We report here the atomic masses of 3H and 3He determined by using Penning trap mass spectrometer Smiletrap. The measurements are based on cyclotron frequency determinations 3H1+ 3He1+ H2+ ions as reference. values for 3.016 049 278 7(25) u 029 321 7(26) u, respectively. From these a new Q-value tritium β-decay was derived resulting in 18.589 8(12) keV, being most accurate value at present. is related to possible rest electron antineutrino.
The anisotropy emission of the Ll X-ray line from heavy atoms (54<or=Z 2 <or=92) has been investigated experimentally for ion impact (1<or=Z 1 <or=79) in energy range 0.15 to 10 MeV amu -1 . In case single ionisation, collisionally induced alignment L 3 subshell can be derived. data H and He projectiles are reasonably well described by direct Coulomb ionisation theories. With increasing Z , measured becomes considerably smaller than impact. No pronounced dependence on projectile...
A strong enhancement of electron-ion recombination over expected rates at sub-eV relative energies is revealed for highly charged ions. Measured ${\mathrm{Ne}}^{10+}$ and ${\mathrm{Ar}}^{13+}$ were found to be enhanced low (1 meV) by factors 4 10 theoretical predictions radiative rates, respectively. It shown that the majority in caused very lying $\ensuremath{\Delta}n=0$ dielectronic resonances; nevertheless, nonresonant contributions measured both systems significantly higher than...
The dielectronic recombination spectrum of ${\mathrm{C}}^{3+}$ was recorded for low collision energies. the ${1s}^{2}2p4\ensuremath{\ell}$ $^{1,3}L$ resonances in range 0--0.6 eV analyzed detail. It found that strongest peaks must be explained by mediated relativistic effects, a process forbidden pure $\mathrm{LS}$ coupling. For strongly autoionizing states natural linewidths were observed. assigned detail aid very accurate many-body perturbation calculations.