Single-electron capture from helium atoms by fast singly positive charged helium ions

K-shell single-electron capture in collision of fast protons with multi-electron atoms

“…Prior CBDW-3B DCS for all considered impact energies show a sharp minimum after the kinematical peak. In contrast to the theoretical prediction of such a sharp dip in the first-order perturbative approaches for different charge-exchange reactions [6,23,25,27,28], the dip is called "unphysical" in the literature since it is not observed in the experimental measurements [6,[29][30][31][32]. For lower energies the post curves fall almost monotonically, hence this minimum is not present in these curves.…”

“…Although, it is found that the prior CBDW-3B approximation is remarkably successful in describing some of the [27] Exp. Data [28] Exp. Data [29] Exp.…”

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

“…3. The experimental data given by Schöffler et al [20] and the theoretical data from the four-body CDW-BIS [20] and three-body CBDW theories [6] are also depicted in this figure. The prior and post graphs, which coincide with each other at angles beyond the dark angle, are not in good agreement with the experimental measurements in this angular region.…”

“…CBDW-4B (prior) CBDW-3B [6] CDW-BIS (4B) [20] Exp. data [20] 60 keV/amu θ lab /mrad (dσ/dΩ) lab /a.u.…”

“…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.…”