Projectile focusing near the recoil-ion threshold

V D RODRÍGUEZ; P A MACRI; R O BARRACHINA

JOURNAL OF PHYSICS: CONFERENCE SERIES

Institute of Physics

Lugar: Bristol, UK; Año: 2007 vol. 58 p. 255 - 258

1742-6588

The post-collisional interactions in ion-atom ionization collisions are studied around the electron capture to the continuum (ECC) process. For this purpose, a suitable double differential cross section is introduced, involving the longitudinal recoil-ion momentum and the projectile transverse momentum transfer. Using the fact that the ECC process is closely related to the threshold in the longitudinal momentum distribution, we study this distribution as a function of the projectile scattering angle. Using the CDW-EIS approximation we theoretically find a focusing (defocusing) effect as we get closer to the distribution threshold for proton (antiproton) impact on He atoms.