235U II hyperfine structures measured by collinear fast-beam-laser and radio-frequency-laser double-resonance spectroscopy

Collinear fast-beam-laser and rf-laser double-resonance spectroscopy have been carried out in 235U II, allowing a detailed study of the hyperfine structure (hfs) of the three low odd configurations 5f3(7s2+6d7s+6d2). Intermediate coupling wave functions, using parametric fitting, have been determined, allowing a parametrization of the hyperfine interaction. Ab initio Dirac--Fock calculations combined with this parameterization of our experimental data have allowed an analysis of the hfs of 235U II, resulting in a new value for the magnetic-dipole moment μ/sub I/ = -0.38(3) nm and a spin density a7/sub s/10 = -2880(75) MHz of the 7s electrons