ANALYTIC CORRELATED WAVE-FUNCTIONS IN MOMENTUM-SPACE OF EXCITED S-STATES OF HELIUM-LIKE IONS

We obtain analytic correlated wave functions in momentum space for the first singly-excited S-states of two electron atomic systems as the F ourier transform of correlated wave functions which provides not only a good estimation for the energy but also a good description of the on e-electron position density, rho(r). Then we study the atomic single-p article momentum-density, gamma(p) and discuss the differences between the singlet and triplet states. All the calculations can be analytica lly performed provided the correlated wave function in position space has been determined.