Abstract
We obtain analytic correlated wave functions in momentum space for the first singly-excited S-states of two electron atomic systems as the Fourier transform of correlated wave functions which provides not only a good estimation for the energy but also a good description of the one-electron position density, ρ(r). Then we study the atomic single-particle momentum—density, γ(p) and discuss the differences between the singlet and triplet states. All the calculations can be analytically performed provided the correlated wave function in position space has been determined.
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