Parametric analysis of the isotope shift and hyperfine structure in the Eu I configuration 4f7 5d 6s

With doppler-reduced intermodulated optogalvanic saturation laserspectroscopy (IMOGS) in Eu I the isotope shift (IS) and hyperfine structure (hfs) of the remaining b8D term of the configuration 4f7 5d 6s was investigated. With the help of former measurements in our group (a6,10D) and by other authors (a8,10D) the IS of the now complete configuration (20 levels) was analysed with wavefunctions by J.-F. Wyart. From the parametric description of the IS resulted the necessity also to include the often neglected small parameter g1(g1(4f, 5d)=9.3(3) MHz), which is mainly due to the specific mass shift. The IS of all 20 levels can be well described by further crossed-second-order parameters g2(5d, 6s)=-401(5) MHz and g3(4f, 6s)=-27(1) MHz and one common J-dependent parameter z5d=40.4(4.1) MHz. - With effective one-electron parameters akl, bkl an interpretation of the magnetic and electric hfs (except for a few disturbed levels) could also be carried out. (orig.)