Projectile angular-differential cross sections for electron transfer processes in ion-helium collisions: Evidence for the applicability of the independent electron model

Electron correlations in single-electron capture from helium by fast protons andαparticles

“…This is not surprising, since the four-body version of the CB1-4B model is obtained as a direct extension of its well-established three-body counterpart. In addition to some works [6,8] which argue that in the independent particle approach can explain the processes studied in this work, the present CB1-4B model can be considered as a reliable theory for single capture at intermediate and high impact energies and might bring some information on electronic correlation effects. The obtained results indicate that the term V corr = 1/r 12 − 1/x 1 in the perturbation potential of the post version, which is connected with the dynamic electron correlations, is important.…”

“…Moreover, Zapukhlyak et al [6] suggested that the appearance of a peak structure in the double ratio of transfer excitation to single transfer versus double excitation to single excitation at 0.5 mrad is not connected with electron-electron correlations. The TC-BGM based on the IEM used by Zapukhlyak and Kirchner [8] has also been applied very recently to electron-transfer processes in p-He and α-He collisions at intermediate impact energies. Their results [8] demonstrate that the IEM, which neglects electron-correlation effects, provides an adequate framework for describing a number of one-and two-electron processes in these systems.…”

“…The TC-BGM based on the IEM used by Zapukhlyak and Kirchner [8] has also been applied very recently to electron-transfer processes in p-He and α-He collisions at intermediate impact energies. Their results [8] demonstrate that the IEM, which neglects electron-correlation effects, provides an adequate framework for describing a number of one-and two-electron processes in these systems. A breakthrough in allowing for dynamic correlation was achieved in the works of Reading and Ford [9,10].…”

Projectile angular-differential cross sections for single electron transfer in fast He + –He collisions

“…Let the position vectors of electron e i (with i = 1, 2) relative to P and T be respectively denoted as i and i . The inter-electron distance vector is given by 12…”

“…The importance of this phenomenon in various fields of science has stimulated theoreticial physicists to propose many semiclassical and fully quantum mechanical models for understanding the capture dynamics in different few-body ion-atom collision systems. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Both differential and integral cross sections for charge transfer in different ion-atom collisions have been the focus of some experimental researches. [20][21][22][23] Single-electron capture in the collision of fast singly positive charged helium ions with helium atoms is one of the processes of interest, for which a large number of measured total cross sections exist in the literature.…”