Laser spectroscopic investigation of isotope shifts in Nd II lines

Abstract The isotope shift of 11 optical transitions in Nd II in the spectral range 420–450 nm have been recorded (in all cases but one for all pairs of even Nd isotopes). For all observed transitions the values of the field shifts, the specific mass shifts and Δ∣ ψ (0)∣ 2 have been evaluated. Using our new data, combined with data reported in earlier papers, term isotope shifts for all pairs of even Nd isotopes have been determined for 27 energy levels and for the configurations: 4 f 4 6 s , 4 f 4 5 d , 4 f 3 5 d 6 s and 4 f 4 6 p as well. It is shown that configuration assignment of a level on the basis of term shift values only is in some cases not satisfactory (as e.g. of the level at 22,696 cm −1 ) and obviously additional information is required.