Frankfurt 2006 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 10: Poster I: Wechselwirkung mit Elektronen und Ionen
A 10.7: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
Electron energy and angular distributions following the projectile ionization in relativistic ion–atom collisions — •S. Fritzsche1, A. Surzhykov2, and T. Stöhlker3 — 1Universität Kassel, D–34132 Kassel, Germany — 2Max–Planck–Institut für Kernphysik, D–69117 Heidelberg, Germany — 3Gesellschaft für Schwerionenforschung, D–64291 Darmstadt, Germany
The projectile ionization of highly–charged, hydrogen–like ions is studied within the framework of first–order perturbation theory and Dirac’s relativistic equation [1]. Emphasis is placed, in particular, on the angular and energy distributions of the emitted electrons as observed in both, the projectile and the laboratory frame. Detailed computations are carried out to investigate the effects from the excited states of the projectiles upon the energy–differential ionization cross sections. For relativistic U 91+ ions, for instance, a small partial population of the excited 2s1/2 state results in a much narrower energy spectrum of the emitted electrons than obtained for the case of a pure K–shell ionization. This behaviour of the differential cross sections might help understand a recent observation by Vane et al. [2] on the ionization of heavy, hydrogen–like projectiles in ultra–relativistic ion–atom collisions. Our calculations clearly indicate that a proper size of the partial–wave expansions is critical in order to ensure an accurate evaluation of the electron energy and angular distributions.
[1] A. Surzhykov and S. Fritzsche, J. Phys. B38, 2711–2721 (2005).
[2] C. Vane et al., Proc. 21st Int. Conf. of the Physics of Electronic and Atomic Collisions (Sendai, Japan), 709 (2000).