The momentum projecting techniques have been well applied so as to explore the mechanisms of electronemissions as well as the dynamical effects which influenced the momentum distribution of the electrons ionized inion-atom collisions[1??3]. Usually, the emitted electrons will be projected onto the scattering plane, which was definedas the plane containing the initial and the final momentum vectors of the projectile, considering the conservationlaws and rotational symmetry around the beam axis. It is well known that the ejected electrons will be influencedsimultaneously by a combined coulomb potential from the recoil ions and the projectile ions. Qualitatively, this
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