- Conference date: 24-28 June 2002
- Location: Rome (Italy)
The high‐energy electron beam ion trap SuperEBIT at the Lawrence Livermore National Laboratory allows the study of the x‐ray emission from highly charged ions interacting with electrons with energy in excess of 200 keV. Radiation from ions as highly charged as Cf96+ has been produced this way. The facility is being used to investigate the contributions from quantum electrodynamics in heavy ions. Here the focus is lithiumlike ions, especially U89+, which provide the opportunity for the most accurate test of QED in highly charged ions. We have also used the facility to measure the degree of x‐ray line polarization as a function of the energy of the electron collision energy. For example, we have studied the linear polarization of the K‐shell emission lines of Fe24+ for electron‐impact energies high as 120 keV. A new area of research is the investigation of nuclear excitation by electronic transitions. This is the inverse process of internal conversion, where an atomic x ray is absorbed by the nucleus resulting in an excited nuclear state. We are planning to study this process in 189Os using 217 keV atomic x rays generated in the interaction with a 196 keV electron beam.
- Electron beams
- Ion trapping
- Internal conversion
- Quantum electrodynamic effects
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