Semi-empirical predictions of energy levels, their Landé [formula omitted] factors and hyperfine structure for the odd-parity configuration system of Ho II

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• A semi-empirical parametrization method applied for the fine and hyperfine structure analysis of experimental data for odd Ho II configuration system is presented. • Very good agreement of calculated and experimental values of energies and hyperfine structure constants is achieved. • The predicted values of energy levels, Landè gJ factors and hyperfine structure constants are presented. We present the results of semi–empirical calculations of the fine ( fs ) and the hyperfine structure ( hfs ) for the odd–parity level system of the holmium ion (Ho II), using all available data. A parametric analysis, both for a fs and hfs , for 5 configurations with all the 4f 10 and 4f 11 core states, by taking into account the second–order effects of perturbation theory, was performed for the first time. The predicted energies of electronic levels together with their Landé g J factors as well as magnetic dipole A and electric quadrupole B hfs constants for unknown levels are listed. The importance of the Landé g J factors in atomic and quantum physics, as well as a complete lack of experimental data on this subject, make our calculated values all the more useful.