Charge Exchange Cross Sections of Hydrogen Ions in Gases

Charge transfer in proton–helium collisions from low to high energy

“…Theory: black solid line, eikonal molecular method, reaction (1); red solid line, eikonal molecular method, reaction (2); black dashed line, eikonal atomic method, reaction (1); red dashed line, eikonal atomic method, reaction (2); dashed-dotted line: Kimura and Lin [9]. Experiments: circles, Stedeford and Hasted [17]; full circles, Latypov and Shaporenko [18]; squares, Kusakabe et al [19]; full triangles, Williams and Dunbar [50]; inverted triangles, Stier and Barnett [51]; diamonds, Rudd et al [52]; full squares, Martin et al [53]; triangles, Shah et al [54], full inverted triangles: Allison [40].…”

“…Theory: black dashed line, eikonal molecular method, reaction (1); red dashed line, eikonal molecular method, reaction (2); black solid line, eikonal atomic method, reaction (1); red solid line, eikonal atomic method, reaction (2). Experiments: crosses, Berkner et al [60]; squares, Schryber [61]; full diamonds, Schwab et al [62]; full triangles, Shah and Gilbody [63]; inverted triangles, Shah et al [54]; triangles, Williams [64]; full inverted triangles, Stier and Barnett [51]; circles, Welsh et al [65]; diamonds, Rudd et al [52]; full circles, Martin et al [53]; plus signs, Allison [40].…”

“…The total charge transfer cross section has been the subject of extensive experimental studies in this energy regime [40,[51][52][53][54][60][61][62][63][64][65][66]. From a theoretical point of view, ion-atom collisions involving two electrons have been used as prototypical systems to investigate various approaches to describe single-electron capture, usually based on the Born distorted wave (BDW) method or the continuum distorted wave (CDW) method in the framework of three-body [13,14,67] or four-body formalisms [12,68,69].…”

Ab initiocalculation of charge transfer in proton collisions with N2

“…(9). In the same figure we have included the experimental results of Stier and Barnett [14], Rudd et al [15], and Gao et al [16], and the theoretical results of Cabrera-Trujillo et al [19]. We note that the CT cross sections corresponding to various values of ρ show very similar shape and magnitude.…”

“…In the experimental side, we note the work of Birely [13], who measured the cross section of the CT process leading to the formation of N + 2 (B 2 + u ). Stier and Barnett [14] and Rudd et al [15] measured CT total cross sections at energies above 5 keV, while Gao et al [16] obtained integrated CT cross sections at 0.5, 1.5, and 5 keV. Luna et al [17] measured the branching ratios of the dissociative and nondissociative channels contributing to CT and Quintana et al [18] measured CT differential cross sections at energies between 0.5 and 3.0 keV, at scattering angles below 1 • , showing that the dominant exit channel is H(1s) + N + 2 (X 2 + g ), although the energy-loss spectra displayed a secondary peak attributed in that work to the formation of H(1s) + N + 2 (C 2 + u ).…”