Role of the recoil ion in single-electron capture and single-ionization processes for collisions of protons with He and Ar atoms

Abstract

In this work the single-electron capture and single-ionization processes are studied for proton collisions with He and Ar atoms at impact energies in the range 25-100 keV. Classical trajectory Monte Carlo simulations are benchmarked against experimental data obtained at the reaction microscope in Bariloche, Argentina, which employs the cold target recoil-ion momentum spectroscopy technique. Special emphasis is placed on describing the momentum transfer to the recoil ion for these collision systems.

Collisional Classical Dynamics at the Quantum Scale

“…This methodology was also used to describe the dynamics of antimatter-atom collisions, considering proton, antiproton, electron and positron collisions on He, and predicted large global effects in the ejected-electron spectra for ionizing collisions when the mass and the charge sign of the projectile are varied [106]. Alternatively, the Independent Events Model (IEV) [107], in which the full rearrangement of the target ion is assumed following the removal of a first electron has also been employed [12,108,109]. One-active-electron treatments have also been used to deal with alkali metals, such as Li(2s), Na(3s) and Na * (3p).…”

Differential cross sections for projectile scattering angle in proton-helium collision at intermediate energies

“…For an intermediate energy region in proton-helium collision, the single capture process is the dominant channel, and the transfer-excitation process is also of interest. Projectile angular-differential cross sections in proton-helium collisions have been reported for elastic scattering [19], excitation [20,21], singleelectron-transfer [22][23][24][25][26][27][28][29]. Differential cross sections (DCSs) offer a more stringent test for theoretical models than the integrated cross sections.…”

Classical and semiclassical non-perturbative treatments of the electron transfer process in the collisional system proton-hydrogen involving initial excited states

“…In addition, the CTMC method is a good approximation at intermediate velocities to investigate electron transfer and ionization processes induced by impact of bare ions [28]. Note that CTMC has been recently used even for collisions between ions and complex targets, e.g., N a(3s), N a * (3p), Li(2s), Ar and He, where the active electron is subject to non-coulomb interactions and requires the use of model potentials [29,30] Nowadays the impressive progress of highlyparallel computers allows the use of the SC-AOCC approach with very large basis sets, which were unusable before due to prohibiting CPU execution time. Therefore, our purpose in this paper is to present a study of the capture processes for proton-hydrogen collisions involving initial excited states, up to H(n ), using non-perturbative SC-AOCC and, for comparison, CTMC approaches.…”

“…Note that CTMC has been recently used even for collisions between ions and complex targets, e.g. ( ) Na s 3 , *( ) Na p 3 , ( ) Li s 2 , Ar and He, where the active electron is subject to non-coulomb interactions and requires the use of model potentials [29,30].…”