Measurement and analysis of isotope shifts inEu+151,153from hyperfine spectra

Abstract
Isotope shifts in Eu+151,153 have been measured for four optical transitions between the metastable levels 4f7 (8S°)5d9D°J and the excited levels 4f7 (8S°7/2)6p3/2;J’ in a collinear laser and slow-ion-beam apparatus. A phenomenological interpretation and an ab initio calculation have been made and compared with experiment.