Fully Differential Cross Sections For C⁶⁺ Single Ionization Of Helium

Three-Coulomb-wave (3C) model is applied to study singleionization of helium by 2 MeV/amu and 100 MeV/amu C6+impact. Fullydifferential cross sections (FDCS) are calculated in the scatteringplane as well as the perpendicular plane and the results are comparedwith corresponding experimental data and other theoreticalpredictions. For 2 MeV/amu, 3C results are in reasonably goodagreement with experiment, especially for the case of lowerejected-electron energies and larger momentum transfers, 3Ccalculations are in better agreement with experiment than 3DW-EISand CP theories in the two peaks, however, for smaller momentumtransfers, the position of the binary peak shifts toward larger anglesand get better with increasing momentum transfer; for 100 MeV/amu,in the scattering plane the 3C results are in very good agreement withexperiment for smaller momentum transfers, especially in the twopeaks the 3C results are in better agreement with experiment thanCDW-EIS and GA results. However, some significant discrepancies arefound for the largest momentum transfer and the perpendicular plane.Furthermore, the contributions of various scattering amplitudes to the FDCS are examined. It is found that the structure of the FDCS isdetermined by the interference pattern of these amplitudes. Moreimportantly, the interaction between the projectile and passiveelectron influence the position and magnitudes of the peaks, so it isnecessary to take into account this interaction in the calculation.Finally, we have studied the influence of the interactions between thescattering projectile and ejected electron and target nucleus on FDCS.By the analysis and comparison, it is shown that for lower incidentenergy, both interactions have larger effect on FDCS; however, forhigher incident energy, the two interactions are not obvious.