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2007 J. Phys. B: At. Mol. Opt. Phys. 40 2333-2344 doi: 10.1088/0953-4075/40/12/009
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Abstract. Triple-differential cross sections for electron impact ionization of helium at 102 eV are presented for both coplanar and perpendicular plane asymmetric geometries within the framework of second-order distorted-wave theory. The closure approximation and the simplified Green's function approximation, which are currently used in the evaluation of the second-order amplitudes, are investigated and the accuracy of the approximations is examined. It is found that second-order effects are significant for this incident energy and the simplified Green's function approximation is generally more valid than the closure approximation.
Print publication: Issue 12 (28 June 2007) |
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