Fully differential cross sections for singly ionizing 1-Mev p+He collisions at small momentum transfer: Beyond the first Born approximation

摘要

We present calculations of the electron angular distributions in the singleionization of helium by 1-MeV proton impact at momentum transfer of 0.75 a.u.and ejected-electron energy of 6.5 eV. The results using the first and secondBorn approximations and the 3C model with different trial helium functions arecompared to the experimental data. A good agreement between theory andexperiment is found in the case of the 3C final state and a strongly correlatedhelium wave function. The electron-electron correlations in the He atom arefound to influence the ratio of the binary and recoil peak intensities.