No abstract

The hyperfine structure of the low-lying atomic levels 4d 2 5 S 2 3F2,3,4 and 4d s 5 s 5F2, 3,< s of 9tZr has been studied using the atomic-beam magnetic-resonance method. Using intermediate coupling wave functions derived for the configurations (4d + 5s) 4 the experimental data are analysed with respect to the effective operator formalism. The effective radial parameters of the magnetic dipole and electric quadrupole interaction are determined for the two configurations 4d 2 5s 2 and 4d 3 5s and are compared with relativistic calculations. The value obtained for the electric quadrupole moment of the 91Zr nuclear ground state is Q =-0.21(2) barn (uncorrected for core polarization effects).

The magnetic-dipole hyperfine interaction constants A of low-lying metastable atomic levels

No abstract

The hyperfine interaction constants A and B of six low-lying metastable fine structure states of the two iridium isotopes 191Ir and a93Ir and the electronic g-factors of these levels have been measured using the atomic-beam magnetic-resonance method. From the values of the magnetic-dipole interaction constants A, corrected for off-diagonal perturbations, we extracted the hyperfine anomaly of a pure 6s-electron state: 19ZAs193= 0.64(7)%. Using nonrelativistic approximations for the effective radial parameters the nuclear electric-quadrupole moments were obtained:(corrected for Sternheimer shielding effects).