Dynamics of ionization mechanisms in relativistic collisions involving heavy and highly-charged ions

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• 作者：D.C. Ionescu and A. Belkacem
• 关键词：PACS. 34.50.Fa Electronic excitation and ionization of atoms (including beam ; foil excitation and ionization) – ; 34.10.+x General theories and models of atomic and molecular collisions and interactions (including statistical theories ; transition state
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2002
• 出版时间：March 2002
• 年：2002
• 卷：18
• 期：3
• 页码：301-307
• 全文大小：406 KB

文摘

The dynamics of mechanisms associated with the ionization of inner-shell electrons in relativistic collisions involving heavy and highly-charged ions is investigated within a nonperturbative approach formulated explicitly in the time domain. The theoretical treatment is based on the exact numerical solution of the time dependent Dirac equation for two Coulomb centers on a lattice in momentum space. We present results for ionization in encounters between 100 MeV/u Au79+ projectile ions impinging on a hydrogen-like uranium target. By directly visualizing the collision dynamics we identify a new ionization mechanism in which electrons are emitted from the internuclear region preferentially in the transverse direction with respect to the projectile trajectory. A striking characteristic of this ionization mechanism is that the velocity of the electron is higher than the projectile velocity.