Effect of the configuration interaction on the theoretical oscillator strengths of the magnesium atom

We present the results of a multiconfiguration calculation of the oscillator strengths for the dipole transitions between 3snl ${}_{}{}^1{}_{}{}^{}$,3L states of a magnesium atom. The effect of the configuration interaction on the change of the calculated oscillator strengths in the length and velocity approximation is discussed in detail. In particular, we have investigated the large shift of the oscillator strengths between groups of transitions due to the strong configuration interaction between the 3$p^2$ configuration and the entire 3snd ${}_{}{}^1{}_{}{}^{}D$ configuration series. The ‘‘accidental’’ agreement between the length and velocity results is also examined.