A5072577167- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Electron and X-Ray Spectroscopy Techniques
- Advanced Chemical Physics Studies
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Nuclear physics research studies
Justus-Liebig-Universität Gießen
2015-2024
GSI Helmholtz Centre for Heavy Ion Research
2019-2020
Electron-impact single ionization of $\mathrm{W}^{19+}$ ions has been studied both experimentally and theoretically. By employing the crossed-beams method, absolute cross sections have measured in energy range from onset up to 1000 eV. Theoretical calculations ionization-cross-section function were performed using configuration-averaged distorted-wave method for electron-ion collision energies 150 keV. Contributions excited long-lived primary-ion-beam admixtures taken into account. The role...
Absolute cross sections for electron-impact single ionisation (EISI) of multiply charged tungsten ions (Wq+) with charge states in the range electron–ion collision energy ranges from below respective thresholds up to 1000 eV were measured employing crossed-beams method. In order extend results higher energies, section calculations performed using subconfiguration-averaged distorted-wave (SCADW) method energies 150 keV. From combined experimental and scaled theoretical rate coefficients...
Recently, we have demonstrated (Jin et al. 2020, J. Phys. B: At. Mol. Opt. 53, 075201) that a hybrid subconfiguration-average and level-to-level distorted wave treatment of electron-impact single ionisation (EISI) W$^{14+}$ ions represents an accurate manageable approach for the calculation EISI cross sections complex ion. Here demonstrate more general validity this by comparing W$^{15+}$ W$^{16+}$ with recent experimental results Schury 015201). Our calculations also account...
We present new experimental and theoretical cross sections for electron-impact single ionization of Xe$^{12+}$ Xe$^{13+}$ ions, double Xe$^{12+}$, Xe$^{14+}$ ions collision energies from the respective thresholds up to 3500 eV. The calculations use fully relativistic subconfiguration-averaged distorted-wave (SCADW) approach and, partly, more detailed level-to-level distorted wave (LLDW) method. find that, unlike in previous work, our agree with ones within uncertainties, except...
The cross section for electron-impact single ionisation of W14+ ions has been calculated by using two different approaches, i.e., the subconfiguration averaged distorted-wave (SCADW) method and more involved level-to-level (LLDW) method. Both methods are found to yield very similar results except 4d->5d excitation-autoionisation (EA) channels that straddles threshold. Accordingly, a hybrid theoretical where $4d\to 5d$ EA SCADW is replaced its LLDW counterpart in good agreement with...
Synopsis Electron-impact ionisation cross sections of tungsten ions in the energy range from threshold to 1000 eV were measured. The experimental are compared with results sub-configuration averaged distorted wave calculations. Derived plasma rate coefficients provided for convenient use modelling.
A transverse free-electron target for crossed-beams collision studies is currently being developed. The will be installed in the main experimental section of FAIR storage ring CRYRING@ESR. setup allow electron-ion with highly charged ions on an unprecedented level detail that comprises, e.g., angle-differential observation photon emission.
Synopsis During recent years we have developed a new high-current electron gun for the Giessen electron-ion crossed-beams experiment aiming at an extension of previously available collision-energy range 1–1000 eV to 3500 eV. Here, report on first measurements absolute cross sections electron-impact ionisation multiply charged xenon ions employing gun. Comparisons with experimental and theoretical data from literature provide convincing evidence that can be operated reliably over entire...
Electron-impact ionization of tungsten ions has been measured in the energy range from threshold up to 1000 eV. Configuration-averaged distorted wave calculations were used explain experimental data.
A high-power electron gun delivering a ribbon-shaped beam with energies of 10-3500 eV and high currents at all is currently being commissioned the electron-ion crossed-beams setup in Giessen. As compared to formerly used [1], new one will enable us perform measurements cross-sections for electron-impact ionization ions wider energy range and, consequently, ion charge states that were not accessible before.