Two and three electron dynamics in transfer ionization

M. S. SCHOFFLER, J. TITZE, L.P.H. SCHMIDT, O. JAGUTZKI, S. OTRANTO, R. OLSON, H. SCHMIDT-BOCKING AND , R. DORNER

Creta, Grecia

Simposio; 20th International Symposium on Ion Atom collisions (ISIAC); 2007

The dynamic in correlated many-particle Coulombic systems is one of the unsolved fundamental problems in AMO-physics. Using transfer ionization (TI) reactions (Pq++He>P(q-1)++He2++e-), we could open a new observation window for ground state correlation effects [2,3]. The data also show a complex and so far unobserved three electron dynamics. We have used the COLTRIMS technology (COLd Target Recoil Ion Momentum Spectroscopy) [1] to determine the momentum vectors of all final state products in a coincident measurement. At high projectile velocities (vP>3 a.u.) the dynamic of TI-processes is nearly independent of the projectile ion. Electron capture occurs due to velocity matching (kinematical capture). Either a second independent process, a binary collision between projectile and remaining electron, or a correlated process (shake-off) can lead to an electron emission. These approximations are also valid for lower velocities (1.5 a.u.), except some post collision effects, if the projectile is bare (proton, He2+). In the case of He+, where an electron originating from the projectile is involved, the collision dynamics change conspicuously. A brief overview of TI at different collision energies (60–630 keV/u) will be given. The main focus is on the influence of different types of projectiles, especially the case of a non-bare-projectile (He+). the case of a non-bare-projectile (He+). References [1] J. Ullrich et al, Rep. Prog. Phys. 66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)37, L201-L208, (2004)q++He>P(q-1)++He2++e-), we could open a new observation window for ground state correlation effects [2,3]. The data also show a complex and so far unobserved three electron dynamics. We have used the COLTRIMS technology (COLd Target Recoil Ion Momentum Spectroscopy) [1] to determine the momentum vectors of all final state products in a coincident measurement. At high projectile velocities (vP>3 a.u.) the dynamic of TI-processes is nearly independent of the projectile ion. Electron capture occurs due to velocity matching (kinematical capture). Either a second independent process, a binary collision between projectile and remaining electron, or a correlated process (shake-off) can lead to an electron emission. These approximations are also valid for lower velocities (1.5 a.u.), except some post collision effects, if the projectile is bare (proton, He2+). In the case of He+, where an electron originating from the projectile is involved, the collision dynamics change conspicuously. A brief overview of TI at different collision energies (60–630 keV/u) will be given. The main focus is on the influence of different types of projectiles, especially the case of a non-bare-projectile (He+). the case of a non-bare-projectile (He+). References [1] J. Ullrich et al, Rep. Prog. Phys. 66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)37, L201-L208, (2004)P>3 a.u.) the dynamic of TI-processes is nearly independent of the projectile ion. Electron capture occurs due to velocity matching (kinematical capture). Either a second independent process, a binary collision between projectile and remaining electron, or a correlated process (shake-off) can lead to an electron emission. These approximations are also valid for lower velocities (1.5 a.u.), except some post collision effects, if the projectile is bare (proton, He2+). In the case of He+, where an electron originating from the projectile is involved, the collision dynamics change conspicuously. A brief overview of TI at different collision energies (60–630 keV/u) will be given. The main focus is on the influence of different types of projectiles, especially the case of a non-bare-projectile (He+). the case of a non-bare-projectile (He+). References [1] J. Ullrich et al, Rep. Prog. Phys. 66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)37, L201-L208, (2004)2+). In the case of He+, where an electron originating from the projectile is involved, the collision dynamics change conspicuously. A brief overview of TI at different collision energies (60–630 keV/u) will be given. The main focus is on the influence of different types of projectiles, especially the case of a non-bare-projectile (He+). the case of a non-bare-projectile (He+). References [1] J. Ullrich et al, Rep. Prog. Phys. 66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)66, 1463 (2003) [2] M. Schöffler et al. J. Phys. B 38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)38, L123-L128, (2005) [3] A. Godunov et al., J. Phys. B37, L201-L208, (2004)37, L201-L208, (2004)