C C Jia et al 2002 J. Phys. B: At. Mol. Opt. Phys. 35 1103 doi:10.1088/0953-4075/35/4/332
C C Jia1,2, A Lahmam-Bennani1,5,6, A Duguet1, L Avaldi3, M Lecas1 and C Dal Cappello4
Show affiliationsThe relative cross sections of Ar double ionization by electron impact have been measured in an (e, 3e) experiment at low incident energy E0 = 561.4 eV, at a scattering angle θa = 6.5° and with equal energy sharing among the two `ejected' electrons, Eb = Ec = 9 eV. The experimental results are compared with calculations in the first Born approximation, which include the shake-off and two-step 1 mechanisms in the target-projectile interaction. The symmetry breaking about the direction of the momentum transfer and the appearance of a small feature near the main ones show that the non-first-order effects (such as two-step 2 mechanism) play an important role. These effects are enhanced in the present experiments with respect to the former ones (El Marji et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 3677) with higher collision energy, E0 = 5563 eV, which is in agreement with an earlier theoretical estimate by McGuire.
Issue 4 (28 February 2002)
Received 23 November 2001, in final form 3 January 2002
Published 13 February 2002
C C Jia et al 2002 J. Phys. B: At. Mol. Opt. Phys. 35 1103
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