Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.43: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
QED effects in Cu-like Pb Recombination Resonances Near Threshold — •Eva Lindroth1, Håkan Danared2, Peter Glans1, Zoran Pešić1, Reinhold Schuch1, Maria Tokman1, and György Vikor1 — 1Atomic Physics, Frescativ. 24, Stockholm University, Sweden — 2Manne Siegbahn Lab., Frescativ. 24, Stockholm University, Sweden
Our knowledge about atomic structure and QED corrections to energy levels is almost exclusively obtained through photon spectroscopy. Although it would hardly have been anticipated a few years ago, resonances in collision cross sections provide today an alternative access to highly accurate information on atomic energy levels. We will show that the presently most accurate measurement of an energy splitting in a few electron highly charged ion is obtained by recombination with free electrons near the ionization threshold. In a study with Pb53+, dielectronic recombination resonances are found for as low as ∼ 10−3−10−4 eV relative energy. The resonance positions are thus fixed very precisely. This can be used to fix the 4p1/2−4s1/2 energy splitting as well. The series of resonances have been calculated by relativistic many-body perturbation theory and through comparison with experiment the Pb53+(4p1/2−4s1/2) energy splitting is determined with an accuracy comparable to the position of the first few resonances, i.e. ∼ 10−3 eV. Such a precision provides a test of QED in a many-body environment at a level which can still not be reached in calculations.