Semi-empirical calculations of radiative decay rates in Mo II. A comparison between oscillator strength parametrization and core-polarization-corrected relativistic Hartree-Fock approaches

•Two different semi-empirical methods were used to study Mo II oscillator strengths. The agreement is excellent between these two approaches and also with experimental values.•A complete list of 2243 transitions from depopulated 4d45p and 4d35s5p odd-parity levels have their oscillator strength and transition probability values computed for a first time.•A survey of many extracted ion transition radial integral values shows clearly a real drop with filling nd-shells of the same principal quantum numbers for ndk(n + 1)s)-> ndk(n + 1)p transitions.

We present a semi-empirical determination of Mo II radiative parameters in a wide wavelength range 1716-8789 Å. Our fitting procedure to experimental oscillator strengths available in the literature permits us to provide reliable values for a large number of Mo II lines, predicting previously unmeasured oscillator strengths of lines involving 4d45p and 4d35s5p odd-parity configurations. The extracted transition radial integral values are compared with ab-initio calculations: on average they are 0.88 times the values obtained with the basic pseudo-relativistic Hartree Fock method and they agree well when core polarization effects are included. When making a survey of our present and previous studies and including also those given in the literature we observe as general trends a decreasing of transition radial integral values with filling nd shells of the same principal quantum numbers for ndk(n + 1)s → ndk(n + 1)p transitions.