Abstract
Fully differential cross section (FDCS) for the transfer excitation (H+ + He → H+He+*) at high proton energies (630 – 1200 keV) is studied both experimentally and theoretically within the simplest Plane Wave First Born Approximation (PWFBA). The role of angular correlations in a trial helium ground state wave function is demonstrated.
Highlights
From an experimental point of view, single-electron transfer has at least two interesting facets
The comparison with our calculations shows that describing the scattering-angle dependence of transfer excitation in fast collisions requires us to go beyond the first Born approximation and in addition to use the initial-state wave function, which contains some degree of angular correlations
The calculation based on a wave function without angular correlation completely fails
Summary
From an experimental point of view, single-electron transfer has at least two interesting facets. In the initial asymptotic state the charged proton does not interact with the neutral helium atom by long-range Coulomb force, and in the final asymptotic state the neutral hydrogen atom does not interact with the charged residual ion He+∗ In this case PWFBA ≡ CB1 (corrected first Born approximation) [33]. SCHO FFLER et al. Here we consider the transfer excitation reaction p + He → H + He+∗ at different high proton energies (300–1200 keV) and present both the experimental single-differential cross sections for total excitation of the residual helium ion (n 2) and the calculations within the PWFBA and the eikonal wave Born approximation (EWBA).
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