Analytical expression for the electronic stopping cross section of atomic gas targets for hydrogen projectiles

Cabrera‐Trujillo, R.

doi:10.1103/physreva.103.032812

Cited by 5 publications

(1 citation statement)

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“…For a review of energy deposition, see [23]. Recently, Cabrera-Trujillo [24] proposed a treatment for the study of the electronic stopping cross section for a hydrogen beam colliding with atomic targets with excellent results when compared to the experimental data. However, the approach combines two different theories, one at low collision energies (Electron-Nuclear Dynamics) that accounts for the electron transfer process and the other at high collision energies (the standard Bethe theory) that considers the excitation and ionization processes.…”

Section: Introductionmentioning

confidence: 99%

Molecular electronic stopping cross section for H and He beams colliding with water: projectile charge state contribution

Cabrera-Trujillo

2023

Phys. Scr.

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When an ion beam impinges on a target material, electron stripping and capture processes involve different charge fraction states in the beam, such that each projectile charge state produces a different energy-loss. In this work, the energy deposition of swift hydrogen and helium ion beams colliding with a water target in the gas phase is studied. The electronic structure of the molecular target is represented in terms of core, bond, and lone pair orbital decomposition within a Harmonic Oscillator representation. In this way, the stopping cross section becomes only a function of the orbital mean excitation energy, I0i . The ion beam charge fraction compositions colliding on water is determined from the work of Wedlund et al. [Astronomy & Astrophysics, 630, A36 (2019)] by accounting for the electron transfer cross sections. We find that the larger the projectile charge state, the larger the electronic stopping cross section and that the beam charge fraction determines the position of the maximum of the electronic stopping curve. Also, in agreement with the experiment, evidence is given on the dominant role of the largest projectile charge state in defining the stopping cross section for high energy collisions, while for low collision energies it is the lowest charge state together with all possible charge states contributing at the maximum of the electronic stopping cross section curve. Our results are reported and compared to available experimental data showing an excellent agreement to the available literature.

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Section: Introductionmentioning

confidence: 99%