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Abstract

The triple differential cross sections for electron impact ionization helium (e, 2e) reactions are calculated by use of the BBK and modified BBK model at different gun angles of incident electron energy 64.6 eV. The structures of the cross sections and the physical natures of these structures are discussed in detail. It is found that for the non-coplanar geometry, cross sections are determined by a variety of effects together and these effects are converted to each other under different conditions. Moreover, strong dynamical screening effect is observed in the final state of the perpendicular plane symmetric geometry.

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1.
Funds:Project supported by National Natural Science Foundation of China (Grant Nos. 10847007, 10876028 and 10964010), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070736001), the Foundation of Center of Theoretical Nuclear Physics of National Laboratory of Heavy Ion Accelerator of Lanzhou, and the Foundation of Northwest Normal University, China (Grant No. NWNU-KJCXGC-03-21).

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Cited By

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Vol. 61, Issue 14 - 2012-07-20

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