Isotope shifts and hyperfine structure in the [Xe]4f(7)5d 6s(2) D-2(J) -> [Xe]4f(7)5d 6s 6p F-9(J+1) transitions of gadolinium

High-resolution resonance ionization mass spectrometry has been used to mea sure isotope shifts and hyperfine structure in all [Xe]4f(7)5d(6)s(2) D-9(J ) --> [Xe]4f(7)5d6s6p F-9(J+1) (J = 2-6) and the [Xe]4f(7)5d6s(2) D-9(6) -- > [Xe]4f(7)5d6s6p, D-9(5) transitions of gadolinium (Gd I). Gadolinium atom s in an atomic beam were excited with a tunable single-frequency laser in t he wavelength range of 422-429 am. Resonant excitation was followed by phot oionization with the 363.8 nm line of an argon ion laser and resulting ions were mass separated and detected with a quadrupole mass spectrometer. Isot ope shifts for all stable gadolinium isotopes in these transitions have bee n measured for the first time. Additionally, the hyperfine structure consta nts of the upper states have been derived for the isotopes Gd-155,Gd-157. a nd are compared with previous work. Using prior experimental values for the mean nuclear charge radii, derived from the combination of muonic atoms an d electron scattering data, field shift and specific mass shift; coefficien ts for the investigated transitions have been determined and nuclear charge parameters lambda for the minor isotopes Gd-152,Gd-154 have been calculate d.