Recent Advances in the Theory and Modelling of Multiple Processes in Heavy-Particle Collisions

T. Kirchner, M. Zapukhlyak, M. F. Ciappina, M. Schulz

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review


Progress in experimental methods and data analysis techniques has enabled detailed and in-depth views on the few-body dynamics which govern heavy-particle atomic collisions. Still, theoretical and computational support is needed to gain a thorough understanding of the measured spectra. This is a challenging task, in particular when multiple-electron transitions are studied in regimes in which standard perturbative methods are not applicable.

This chapter explores two avenues that have been followed to meet this challenge. First, the coupled-channel basis generator method has been extended in order to calculate projectile angular differential cross sections for processes involving electron transfer. Somewhat surprisingly, it is found that the independent particle model works well, in some cases even for double capture, which is commonly believed to be a correlated process. Second, first- and higher-order perturbative models have been used in conjunction with a Monte Carlo event generator to investigate double ionization of helium. The Monte Carlo event generator provides theoretical event files which are analogous to data obtained from kinematically complete experiments. As it turns out, these event files form a seminal starting point to shed new light on the roles of different double-ionization mechanisms.
Original languageEnglish
Title of host publicationFast Ion-Atom and Ion-Molecule Collisions
PublisherWorld Scientific Publishing Co. Pte Ltd
StatePublished - 1 Dec 2012
Externally publishedYes


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