Acceptance-angle effects on the charge transfer and energy-loss cross sections for collisions of C4+ with atomic hydrogen

Cabrera-Trujillo, R.; Bruhns, H.; Savin, Daniel Wolf

The charge-transfer process for collisions of C4+ with atomic hydrogen is studied theoretically and experimentally in this work. Our theoretical study is based on an electron-nuclear dynamics approach applied here for the state-to-state and total contributions to the electron-capture cross sections. Our theoretical results are complemented by experimental measurements of the absolute total cross section for collisions of C4+ with atomic hydrogen, which were carried out using an ion-atom merged-beams technique at relative collision energies of 0.122 – 2.756 keV/u and performed with an improved apparatus at Oak Ridge National Laboratory. We find that the structure observed around a collision energy of 0.5 keV/u in the experimental results is due to the combined contributions of the 3ℓ capture cross sections, the coupling of the electronic and nuclear dynamics, and the acceptance angle in the experimental configuration. We also report the C4+ kinetic energy loss and stopping cross section. We find that the C4+ gains energy for relative collision energies between 0.1 and 10 keV/u, with a maximum at ∼1 keV/u. Our theoretical study shows that, to compare to the merged-beams experimental results, one has to account for effects produced by the merged path length of the apparatus.


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Also Published In

Physical Review A

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Academic Units
Astronomy and Astrophysics
Published Here
March 15, 2023