A FULL FOUR-BODY CONTINUUM DISTORTED WAVE – EIKONAL INITLA STATE MODEL FOR IONIZATION OF He BY ION IMPACT

MONTI, JUAN MANUEL; FOJÓN, OMAR ARIEL; HANSSEN, JOCELYN; RIVAROLA, ROBERTO DANIEL

The University of Electro-Communications, Chofu, Tokyo, Japon

Conferencia; HCI 2008 - 14th International Conference on the Physics of Highly Charged Ions; 2008

<!-- @page { size: 21cm 29.7cm; margin: 2cm } P { margin-bottom: 0.21cm } --> <!-- @page { size: 21cm 29.7cm; margin: 2cm } P { margin-bottom: 0.21cm } --> A FULL FOUR-BODY CONTINUUM DISTORTED WAVE – EIKONAL INITLA STATE MODEL FOR IONIZATION OF He BY ION IMPACT J. M. Monti(*), O. A. Fojón(*),J. Hanssen(+) yR. D. Rivarola(*) (*)Instituto de Física Rosario CONICET-Universidad Nacional de Rosario, 2000 Rosario, Argentina (+) Institut de Physique, Laboratoire de Physique Moléculaire et des Collisions, Université Paul Verlaine-Metz, 57078 Metz Cedex, France Electron ionization of atomic targets produced in collisions with bare ions is usually studied using three-body distorted wave approximations. The three considered bodies are the incident projectile, the residual target and the active electron (the electron to be ionized as a consequence of the collision). The other electrons, the passive ones, are assumed to remain as frozen in their initial orbitals during the reaction (see for example Ref. [1]). Four-body distorted wave models were preserved in both the entry and exit channels but only the active electron was considered to be distorted by the projectile. In order to avoid any asymmetric description of the target electrons we consider both of them as active electron in a four-body Continuum Distorted Wave – Eikonal Initial State (CDW-EIS) approximation. Thus, the initial bound state is distorted in the entry channel by two eikonal phases associated with the interaction of the projectile with each one of the target electrons. These phases correspond to an approximated description of the projectile-target electron continuum states for large enough collision velocities. As we are interested in ionization-excitation processes the residual bound wave function is distorted by a projectile-residual target electron eikonal phase as in the single-electron excitation Symmetric Eikonal (SE) approximation [4] and the emitted electron is considered to move in the combined fields of the projectile and residual target as in the single-electron ionization CDW-EIS model [5]. The use of four-body representations where the two electrons are considered as active ones, allows the study of the influence of static and dynamical electron correlation on multiple differential and total cross sections. The case of a bare ion impacting on a He target will be presented in the conference. References [1] P. D. Fainstein, V. H. Ponce y R. D. Rivarola, J. Phys. B 21, 287 (1988). [2] Dz. Belkic, J. Phys. B 30, 1731 (1997). [3] Dz. Belkic, Nucl. Instr. Meth. B 124, 365 (1997). [4] G. R. Deco, P. D. Fainstein y R. D. Rivarola, J. Phys. B 11, 213 (1986). [5] D. S. F. Crothers y J. F. McCann, J. Phys. B 16, 3229 (1983).