Theory of ionization processes in positron–atom collisions

✍ Scribed by R. Della Picca; J. Fiol; R.O. Barrachina; V.D. Rodríguez

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 272 KB
• Volume: 247
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2006.01.039

✦ Synopsis

We review past and present theoretical developments in the description of ionization processes in positron-atom collisions. Starting from an analysis that incorporates all the interactions in the final state on an equal footing and keeps an exact account of the few-body kinematics, we perform a critical comparison of different approximations, and how they affect the evaluation of the ionization cross section. Finally, we describe the appearance of fingerprints of capture to the continuum, saddle-point and other kinematical mechanisms.