title: QED effects in Cu-like Pb recombination resonances near threshold.
abstract: In an electron-ion recombination study with Pb53+ dielectronic recombination resonances are found for as low as approximately 10(-3)-10(-4) eV relative energy. The resonances have been calculated by relativistic many-body perturbation theory and through comparison with experiment the Pb53+(4p(1/2)-4s(1/2)) energy splitting of approximately 118 eV is determined with an accuracy comparable to the position of the first few resonances, i.e., approximately 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.
authors.affiliation: Department of Atomic Physics, Stockholm University, Frescativägen 24, SE-104 05 Stockholm, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Lindroth
authors.forename: H
authors.initials: H
authors.lastname: Danared
authors.forename: P
authors.initials: P
authors.lastname: Glans
authors.forename: Z
authors.initials: Z
authors.lastname: Pesić
authors.forename: M
authors.initials: M
authors.lastname: Tokman
authors.forename: G
authors.initials: G
authors.lastname: Vikor
authors.forename: R
authors.initials: R
authors.lastname: Schuch