Benchmarking high-field few-electron correlation and QED contributions in Hg{sup 75+} to Hg{sup 78+} ions. I. Experiment
- Max-Planck-Institut fuer Kernphysik, D-69117 Heidelberg (Germany)
- St. Petersburg State University, St. Petersburg 198504 (Russian Federation)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
The photorecombination of highly charged few-electron mercury ions Hg{sup 75+} to Hg{sup 78+} has been explored with the Heidelberg electron beam ion trap. By monitoring the emitted x rays (65-76 keV) and scanning the electron beam energy (45-54 keV) over the KLL dielectronic recombination (DR) region, the energies of state-selected DR resonances were determined to within {+-}4 eV (relative) and {+-}14 eV (absolute). At this level of experimental accuracy, it becomes possible to make a detailed comparison to various theoretical approaches and methods, all of which include quantum electrodynamic (QED) effects and finite nuclear size contributions (for a 1s electron, these effects can be as large as 160 and 50 eV, respectively). In He-like Hg{sup 78+}, a good agreement between the experimental results and the calculations has been found. However, for the capture into Li-, Be-, and B-like ions, significant discrepancies have been observed for specific levels. The discrepancies suggest the need for further theoretical and experimental studies with other heavy ions along these isoelectronic sequences.
- OSTI ID:
- 20787262
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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