Multiconfiguration Hartree-Fock calculations of the oscillator strength for the 2s2pp21,2sndD1(n=3–6) transitions in beryllium

The multiconfiguration Hartree-Fock method has been applied successfully to the calculation of oscillator strength for the transitions 2s2p ${}^1$P°→2$p^2$,2snd ${}^1$D (n=3–6) in beryllium. The effects of electron correlation, which are very important for these calculations, have been taken into account accurately through the configuration-interaction procedure. The length and velocity results of the oscillator strength as well as the calculated and experimental transition energies are in excellent agreement. The present results compare well with experiment and other available theoretical data.