Oscillator strengths and branching fractions of 4d75p-4d75s Rh II transitions

•Rh II transition probabilities and branching fractions were derived from the predetermined oscillator strength values and compared with those obtained experimentally or through another approach like pseudo-relativistic Hartree-Fock model including core-polarization effects.•The well-founded basis of previous data given in the literature was confirmed using another approach.•Radial integral of the Rh II main transition: 4d75p-5d75s was evaluated for the first time.•Predicted values of oscillator strength, transition probability, and branching fraction lie in a new wide wavelength range.

This work reports semi-empirical determination of oscillator strengths, transition probabilities and branching fractions for Rh II 4d75p-4d75s transitions in a wide wavelength range. The angular coefficients of the transition matrix, beforehand obtained in pure SL coupling with help of Racah algebra are transformed into intermediate coupling using eigenvector amplitudes of these two configuration levels determined for this purpose; The transition integral was treated as free parameter in the least squares fit to experimental oscillator strength (gf) values found in literature. The extracted value: <4d75s|r1|4d75p> =2.7426 ± 0.0007 is slightly smaller than that computed by means of ab-initio method. Subsequently to oscillator strength evaluations, transition probabilities and branching fractions were deduced and compared to those obtained experimentally or through another approach like pseudo-relativistic Hartree-Fock model including core-polarization effects.