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Abstract

Hyperfine structure A and B factors of the atomic 5s5p ³P₂ → 5s6s ³S₁ transition are determined from collinear laser spectroscopy data of ^107−123Cd and ^111m−123m Cd. Nuclear magnetic moments and electric quadrupole moments are extracted using reference dipole moments and calculated electric field gradients, respectively. The hyperfine structure anomaly for isotopes with s_1/2 and d_5/2 nuclear ground states and isomeric h_11/2 states is evaluated and a linear relationship is observed for all nuclear states except s_1/2. This corresponds to the Moskowitz-Lombardi rule that was established in the mercury region of the nuclear chart but in the case of cadmium the slope is distinctively smaller than for mercury. In total four atomic and ionic levels were analyzed and all of them exhibit a similar behaviour. The electric field gradient for the atomic 5s5p ³P₂ level is derived from multi-configuration Dirac-Hartree-Fock calculations in order to evaluate the spectroscopic nuclear quadrupole moments. The results are consistent with those obtained in an ionic transition and based on a similar calculation.