Angular distributions and Dalitz plots for C6+ionization of He

S Otranto, R E Olson, J Fiol
2006 Journal of Physics B: Atomic, Molecular and Optical Physics  
Single ionization fully differential cross sections for 2 MeV/amu C 6+ + He collisions are obtained and analysed using the classical trajectory Monte Carlo and continuum distorted wave models. The present theoretical results are compared with the recent experimental data of Fischer et al. The published experimental conditions are considered in both theoretical models. The inclusion of the momentum distribution of the target atom leads to an improved description of the forward electron emission.
more » ... electron emission. Dalitz plots for single ionization fully differential cross sections in ion-atom collisions are presented and are used to help elucidate the collision dynamics. (Some figures in this article are in colour only in the electronic version) Single ionization of He by highly charged particle impact has been the subject of intensive studies during the last few years. The availability of kinematically complete experiments provides new insight into the dynamics of ion-atom collisions [1, 2] and illustrates collision dynamics in a way only previously achieved for electron-atom studies [3] . Even though fully differential cross sections (FDCS) have been calculated for electronatom collisions for more than 35 years, the first theoretical FDCS for ion-atom collisions were presented by Berakdar et al in 1993 for proton and antiproton impact of atomic hydrogen on helium [4] . In their work they presented angular and energy distributions and illustrated the differences between particle and antiparticle impact. Later, in 1996 Gasaneo et al published continuum distorted wave (CDW) FDCS for the proton-hydrogen collision system and represented them in momentum space for the ionized electron [5] . With such a representation, they identified the ring-shaped pattern that corresponds to a double binary collision with the target. This work was closely followed by classical trajectory Monte Carlo (CTMC) calculations that provided fully differential cross sections to illustrate the evolution of the charge-transfer-to-the-continuum peak [6] . Even though experimental data for much
doi:10.1088/0953-4075/39/7/l05 fatcat:7eag2axdwbcbdcsbdhe5qcphiy