Generalized oscillator strength for the potassium resonance transition

The generalized oscillator strength (GOS) is an important property of the a tom which manifests the atomic wavefunction directly. GOSs for the potassiu m resonance transition have been investigated using the spin-polarized tech nique of the random-phase approximation with exchange (RPAE) and,the Hartre e-Fock approximation (HFA). Two minima are predicted by both calculations. The first minimum, which is narrower and has never been measured before, is predicted by the RPAE at a momentum transfer value of K = 0.8838 au, while the second is the well measured one at 2.907 au. The positions of the mini ma are found to be influenced by inter-shell correlations significantly. We recommend a careful experimental search for the first minimum around the p redicted value.