INCORPORATION OF THRESHOLD PHENOMENA IN 3-BODY COULOMB CONTINUUM WAVE-FUNCTIONS

In this work a three-body Coulomb wavefunction for the description of two continuum electrons moving in the field of a nucleus is constructe d such that the Wannier threshold law for double escape is reproduced and the asymptotic Coulomb boundary conditions as well as the Kato cus p conditions are satisfied. It is shown that the absolute value of the total cross section, as well as the spin asymmetry, are well describe d by the present approach. Further, the excess-energy sharing between the two escaping electrons is calculated and analysed in light of the Wannier theory predictions. This is the first time an analytical three -body wavefunction is presented which is asymptotically exact and capa ble of describing threshold phenomena.