title: Dielectronic resonance method for measuring isotope shifts.
abstract: Long standing problems in the comparison of very accurate hyperfine-shift measurements to theory were partly overcome by precise measurements on few-electron highly charged ions. Still the agreement between theory and experiment is unsatisfactory. In this Letter, we present a radically new way of precisely measuring hyperfine shifts, and demonstrate its effectiveness in the case of the hyperfine shift of 4s1/2 and 4p1/2 in 207Pb53+. It is based on the precise detection of dielectronic resonances that occur in electron-ion recombination at very low energy. This allows us to determine the hyperfine constant to around 0.6 meV accuracy which is on the order of 10%.
authors.affiliation: Atomic Physics, Stockholm University, AlbaNova, S-106 91 Stockholm, Sweden.
authors.forename: R
authors.initials: R
authors.lastname: Schuch
authors.forename: E
authors.initials: E
authors.lastname: Lindroth
authors.forename: S
authors.initials: S
authors.lastname: Madzunkov
authors.forename: M
authors.initials: M
authors.lastname: Fogle
authors.forename: T
authors.initials: T
authors.lastname: Mohamed
authors.forename: P
authors.initials: P
authors.lastname: Indelicato