Theoretical investigation of the p + He → H + He+ and p + He → H + He++ + e reactions at very small scattering angles of hydrogen

Popov, Yu. V.; Чулуунбаатар, О.; Vinitsky, S. I.; Ancarani, L. U.; Cappello, C. Dal; Vinitsky, P. S.

doi:10.1134/1.1520594

Cited by 10 publications

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“…Direct capture presumes the "usurpation" of one target electron by the fast projectile proton, like it was described in [3], and releasing of another electron due to the sudden rearrangement of the field in the residual ion (typical SO). If the fast proton is described by the plane wave in the lab frame, and its scattering angles are very small (fractions of mrad), then the OBK-mechanism [3] presents the principal transition matrix element alike to that for Electron Momentum Spectroscopy [5] (see also [6]). In turn, it was shown that latter one is very sensitive to angular and radial electron-electron correlations in the target [7].…”

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confidence: 99%

Two-dimensional electron-momentum distributions for transfer ionization in fast proton-helium collisions

et al. 2013

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The momentum distribution of the electron in the reaction p+He → H + He 2+ + e is measured for projectile energies E p =300 and 630 keV/u at very small scattering angles of hydrogen. We mainly present two dimensional distributions parallel (k || ) and perpendicular (k ⊥ ) to the projectile beam. Theoretical calculations were carried out within the Plane Wave First Born Approximation (PWFBA), which includes both electron emission mechanisms, shake-off and sequential capture and ionization. It is shown that electron correlations in the target wave function play the most important role in the explanation of experimentally observed backward emission. Second order effects have to be involved to correctly describe the forward emission of the electron. * Electronic address: schoeffler@atom.uni-frankfurt.de 2

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