Full hyperfine structure analysis of singly ionized molybdenum

- Full fine structure study.
- First Mo II hyperfine structure analysis.
- Comparison of single-electron parameter values extracted semi-empirically with those computed by means of ab-initio method.
- Predicted A and B HFS constant values for not yet measured level splitting.

For a first time a parametric study of hyperfine structure of Mo II configuration levels is presented. The newly measured A and B hyperfine structure (hfs) constants values of Mo II 4d5, 4d45s and 4d35s2 configuration levels, for both 95 and 97 isotopes, using Fast-ion-beam laser-induced fluorescence spectroscopy [1] are gathered with other few data available in literature. A fitting procedure of an isolated set of these three lowest even-parity configuration levels has been performed by taking into account second-order of perturbation theory including the effects of closed shell-open shell excitations. Moreover the same study was done for Mo II odd-parity levels; for both parities two sets of fine structure parameters as well as the leading eigenvector percentages of levels and Landé-factor gJ, relevant for this paper are given. We present also predicted singlet, triplet and quintet positions of missing experimental levels up to 85000 cm−1. The single-electron hfs parameter values were extracted in their entirety for 97Mo II and for 95Mo II: for instance for 95Mo II, a4d01=−133.37 MHz and a5p01=−160.25 MHz for 4d45p; a4d01=−140.84 MHz, a5p01=−170.18 MHz and a5s10=−2898 MHz for 4d35s5p; a5s10=−2529 (2) MHz and a4d01=−135.17 (0.44) MHz for the 4d45s. These parameter values were analysed and compared with diverse ab-initio calculations. We closed this work with giving predicted values of magnetic dipole and electric quadrupole hfs constants of all known levels, whose splitting are not yet measured.