Readspeaker menu


The group focuses on the exploration of the particle dynamics in the realm of strong and critical Coulomb and photon fields with particle emphasis on Quantum Electrodynamics. For this purpose highly charged ions and strong laser fields and their combination are particularly well suited but require the development of dedicated diagnostics and instrumentation. As examples, within our experimental campaigns various x-ray detection systems such as 2D/3D position-sensitive and energy-dispersive detectors, crystal spectrometers, x-ray CCDs, novel x-ray polarimeters, and micro-calorimeters are getting developed and used as well as ion sources, storage rings, and traps to study ions in intense laser light.


Expectation value of the electric field strength <E> for a K-shell electron in H-like ions as a function of the nuclear charge number Z. For comparison, the field active in a strong laser pulse is indicated. By using ions of different Z the balance between the energy in the laser field and the binding energy of the K-shell electrons can be varied in a wide range.

Research areas

Prof. Stöhlker's research interests are focused on electron dynamics in strong and even extreme fields, with particular emphasis of the effects of quantum electrodynamics (QED):

  • experiments on bound-state QED and the atomic structure of few-electron ions at high-Z
  • radiative processes in collisions of relativistic particles (ions and electrons)
  • collision dynamics involving heavy ions
  • light matter interaction in the strong-field regime
  • application of advanced x-ray and electron-detector and spectrometer concepts

Teaching fields

Prof. Stöhlker's teaching is focused on the physics of simple atomic systems, including the atomic structure, atomic collisions, and fundamental aspects such as QED and parity violation. He gives courses and seminars in:

  • key experiments in modern atomic physics
  • the interaction of high-energy radiation with matter

Research methods

Prof. Stöhlker runs sophisticated setups for photon, x-ray, electron, and ion spectroscopy which are used for the studies at storage rings, traps and synchrotrons, including:

  • energy, time and spatially resolving detectors for x-ray imaging and polarimetry of hard x-rays
  • x-ray spectrometers of transmission and reflection type
  • micro calorimeters
  • dense-cluster targets for H2, He, N2, Ne, Ar, Xe

>>link to the Group for Atomic Physics in Extreme Coulomb & Laser Fields

Border Bottom