Doubly differential recoil-ion longitudinal momentum distributions from electron DDCS measurements in ion-atom ionization

We have used the energy and angular distribution of the low energy electron emission to derive the doubly differential final-state longitudinal moment um distributions of the recoil-ions in ion-atom ionization. The complementa ry nature of the electron spectroscopy and the recoil-ion momentum spectros copy has been investigated using a formulation based on three body kinemati cs. The separation of the three-body and binary collision branches of recoi l-ion distributions is a novel feature of the present technique.