Quantum interference of K capture in energetic Ge31+(1s)−

Abstract

We have measured characteristic K x rays in coincidence with the scattered particles from collisions of hydrogenlike Ge ions with Kr atoms. The ions were first accelerated to 8.6 MeV/amu, post-stripped to H-like charge state, and decelerated to around 2.5 MeV/amu. From the measurements the probabilities for K-shell to K-shell charge transfer as a function of collision impact parameters were obtained. The probabilities show an onset of oscillations which are interpreted as quantum interference between the K-shell to K-shell electron transfer amplitudes in two spatially separated coupling regions in the incoming and outgoing parts of the collision. The probabilities of K-shell vacancy distribution created by the collision are calculated within a relativistic independent electron model using the coupled-channel approach with atomlike Dirac-Fock-Sturm orbitals. A reasonable agreement between the theoretical results and the experimental data is found.

Single and double $K$-shell vacancy production in slow Xe$^\textrm{54+,53+}$-Xe collisions

“…[9,10] and has been compared to experimental results in Refs. [19,24,36]. For Xe 54+ +Xe collisions at 30 MeV/u, theoretical results for the impact-parameter dependent single and double K-shell vacancy production probabilities were presented in Ref.…”

“…Numerous experiments with slow heavy ions at particle accelerators focused on impact-parameter dependencies of charge transfer processes [2,[11][12][13][14][15][16][17][18][19][20]. For incoming bare projectiles, single and double K-shell vacancy production was investigated, which for near-symmetric systems towards low collision energies is dominated by quasi-resonant electron transfer from the target K-shell to the projectile K-shell [20][21][22][23].…”

“…Therefore, early experiments already applied an acceleration-deceleration technique at linear accelerators, where a stripper target was used in between the acceleration and the deceleration stages. Nevertheless, the beam energies available at these facilities limited the projectile charge q and atomic number Z to the mid-q high-Z range [2,[14][15][16] or the high-q mid-Z range [17][18][19][20].…”