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On the high-energy limits for the double-to-single ionization ratio of helium and helium-like ions in collisions with charged and neutral particles

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Voitkiv,  A.B.
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Müller,  C.
Division Prof. Dr. Christoph H. Keitel, MPI for Nuclear Physics, Max Planck Society;

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Citation

Voitkiv, A., Müller, C., & Grün, N. (2003). On the high-energy limits for the double-to-single ionization ratio of helium and helium-like ions in collisions with charged and neutral particles. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 205, 504-507.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8EEC-B
Abstract
We compare ionization of helium and helium-like ions in collisions with highly charged ions and neutral atoms in the asymptotic high-energy limit γ --> ∞, where is the collisional Lorentz factor. In the case of ionization of helium and helium-like ions by charged particles, the asymptotic high-energy double-to-single ionization ratio is independent of the properties of the ionizing agent and depends on the nuclear charge of the helium-like system. In contrast to that, in the case of ionization of helium-like ions by neutral atoms, this ratio is nearly independent of the nuclear charge of the helium-like ion but strongly depends on the atomic number of the ionizing agent (neutral atom), provided the condition Z1Z2>0.4c is fulfilled where Z1 is the nuclear charge of the helium-like ion, Z2 is the atomic number of the neutral atom, and c=137 is the speed of light.