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Theoretical Analysis on Fully Differential Cross-Sections for C^6＋ Single ionization of Helium

Chinese Journal of Chemical Physics 2014年第3期27卷 279-284页

作者： Hui-xiao Duan Shi-yan Sun Xiao-ying Fang Rui-fang Zhang Xiang-fu Jia Center for Molecular Research School of Physics and Information Engineering Shanxi Normal UniversityLinfen 041004 China

The four-body model has been used to calculate the fully differential cross-sections （FDCS） for the single ionization of helium by 100 MeV/amu Ca^＋ impact in geometries. By comparing with experimental data and other theories, we find the results of four-body model are in very good agreement in the scattering plane, but poor agreement out of the scattering plane. Accordingly, the contributions of different scattering amplitudes to FDCS are analyzed. It is found that the cross sections due to the interference of the scattering amplitudes between projectile-target nucleus interaction and projectile-ejected electron interaction almost tend to experimental results around the recoil region in geometries. In particular in the perpendicular plane, the cross section originating from interference of the scattering amplitudes between projectile-target nucleus and projectile-ejected electron interactions yields an experimental double-peak structure in the angular distribution. However, this feature could not be presented by the interference of the three amplitudes. Thus, the failure of the fourbody model predicting the feature in this geometry may be attributed to an inappropriate weighting of the three amplitudes.

关键词： ion-impact ionization Fully differential cross section Four-body model Interference effect

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Single ionization of helium atoms by energetic fully stripped carbon ions

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Chinese Physics B 2015年第10期24卷 154-159页

作者： Ebrahim Ghanbari-Adivi Sadjad Eskandari Department of Physics Faculty of SciencesUniversity of Isfahan

A four-body distorted wave approximation is presented for theoretical investigations of the single ionization of groundstate helium atoms by fully stripped carbon ions at impact energies of 2 MeV/amu and 100 MeV/amu. The nine-dimensional integrals for the partial quantum-mechanical transition amplitudes of the specified reaction are reduced to some analytical expressions or one-dimensional integrals over real variables. Fully differential cross sections（FDCSs） are calculated and compared with their experimental values as well as the results obtained from other theories. Despite the simplicity and quickness of the proposed quadrature, the comparison shows that the obtained results are in reasonable agreement with the experiment and are compatible with those of other complicated theories.

关键词： ion-impact ionization four-body distorted wave approximation transition amplitude fully differ- ential cross sections

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Theoretical analysis on fully differential cross sections for C^(6+)impact ionization of helium

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Chinese Physics B 2014年第6期23卷 188-192页

作者：方小英张瑞芳段慧晓孙世艳贾祥富 Center for Molecules Research School of Physics and Information Engineering Shanxi Normal University

Fully differential cross sections （FDCS） are calculated within a four-body model for single ionization of helium by C6＋ impact at the incident energy of 100 MeV/a.u. （atomic unit）. The results are compared with experimental data and other theoretical predictions. It is shown that our results are in very good agreement with experiment for three small momentum transfers in the scattering plane; however, some significant discrepancies are still present at the largest momentum transfer in both the scattering plane and the perpendicular plane. In actuality, the problem has not been explained by the theory during the last decade. Accordingly, the contributions of different scattering amplitudes to FDCS are analyzed. It is found that for the largest momentum transfer the cross section arising from a destructive interference of the three amplitudes is much smaller than the experimental data. However, the cross section due to the constructive interference of two scattering amplitudes between projectile-ionized electron interaction and projectile-passive electron interaction almost approaches the experimental data.

关键词： ion-impact ionization fully differential cross section four-body model interference effect

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