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.