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A: Atomphysik

A 11: Postersitzung 1

A 11.27: Poster

Dienstag, 25. März 2003, 16:00–18:30, Poster

Appearance and disappearance of second Born effects in the (e,3e) reaction on He — •Tatiana Alexandrova¹, Alexander Dorn¹, Anatoli Kheifets², Claus Dieter Schröter¹, Adel Shaheen¹, Bennaceur Najjari¹, Conny Höhr¹, Robert Moshammer¹, and Joachim Ullrich¹ — ¹Max-Planck-Institut für Kernphysik — ²Australian National University, Canberra, ACT 0200

We demonstrate, both experimentally and theoretically, quantitative manifestation of the second Born effects in the angular distributions of two ejected electrons produced by a 500 eV electron impact on the He atom. The second Born contribution, due to subsequent interaction of the projectile with the target, is most prominent for glancing collisions with small momentum transfer. However, these effects are absent for hard knock-out collisions with large momentum transfer.