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Chin. Phys. B, 2015, Vol. 24(1): 013401    DOI: 10.1088/1674-1056/24/1/013401
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

Electron correlation in fast ion-impact single ionization of helium atoms

E. Ghanbari-Adivi, S. Eskandari
Department of Physics and Isfahan Quantum Optics Group (IQOG), Faculty of Science, University of Isfahan, Isfahan 81746-73441, Iran
Abstract  

A four-body distorted-wave approximation is applied for theoretical analysis of the fully differential cross sections (FDCS) for proton-impact single ionization of helium atoms in their ground states. The nine-dimensional integrals for the partial amplitudes are analytically reduced to closed-form expressions or some one-dimensional integrals which can be easily calculated numerically. Calculations are performed in the scattering and perpendicular planes. The influence of the target static electron correlations on the process is investigated using a number of different bound-state wave functions for the ground state of the helium targets. An illustrative computation is performed for 75-keV proton-helium collisions and the obtained results are compared with experimental data and other theoretical predictions. Although for small momentum transfers, the comparison shows a reasonable agreement with experiments in the scattering and perpendicular planes, some significant discrepancies are still present at large momentum transfers in these planes. However, our results are compatible and for some cases, better than those of the other sophisticated calculations.

Keywords:  single ionization      four-body collision      distorted-wave approximation      electron correlation  
Received:  17 August 2014      Revised:  25 November 2014      Accepted manuscript online: 
PACS:  34.80.Dp (Atomic excitation and ionization)  
Corresponding Authors:  E. Ghanbari-Adivi     E-mail:  ghanbari@phys.ui.ac.ir

Cite this article: 

E. Ghanbari-Adivi, S. Eskandari Electron correlation in fast ion-impact single ionization of helium atoms 2015 Chin. Phys. B 24 013401

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