Absolute rate coefficients for photorecombination and electron-impact ionization of magnesiumlike iron ions from measurements at a heavy-ion storage ring

Photorecombination and Photoionization Experiments at Heavy-Ion Storage-Rings and Synchrotron-Light Sources

Recent experimental work on the photorecombination and the photoionization of astrophysically relevant atomic ions employing the merged-beams technique at heavy-ion storage-rings and synchrotron-light sources, respectively, is summarized. The resulting absolute photoionization cross sections and recombination rate coefficients benchmark corresponding theoretical calculations and are needed for ...

Absolute rate coefficients for photorecombination of beryllium-like and boron-like silicon ions

We report measured rate coefficients for electron–ion recombination of Si forming Si and of Si forming Si, respectively. The measurements were performed using the electron–ion merged-beams technique at a heavy-ion storage ring. Electron–ion collision energies ranged from 0 to 50eV for Si and from 0 to 2000eV for Si, thus, extending previous measurements for Si (Orban et al 2010 Astrophys.J. ...

Storage ring cross section measurements for electron impact ionization of Fe8+

We have measured electron impact ionization (EII) for Fe forming Fe from below the ionization threshold to 1200 eV. These measurements were carried out at the TSR heavy ion storage ring. The objective of using a storage ring is to store the ion beam initially so that metastable levels decay, thereby allowing for measurements on a well-defined ground-level ion beam. In this case, however, some m...

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Collisional processes and details of atomic structure of heavy many-electron atoms and ions are not yet understood in a fully satisfying manner. Experimental studies are required for guiding new theoretical approaches. In response to fusion-related needs for collisional and spectroscopic data on tungsten atoms in all charge states, a project has been initiated in which electron-impact and photo...

Electron impact ionization measurements at the Heidelberg heavy ion storage ring TSR