Energy and angle resolved measurements have been performed in the double photoionization of helium. Whereas the angular distributions do not depend much on the energy sharing (E₁,E₂) at 4 eV above threshold, a strong effect is observed at E0ex0ex=0ex0ex18.6 eV. These results can be analyzed qualitatively if the total amplitude is split into two parts which are, respectively, symmetric (ag) and antisymmetric (aᵤ) in the interchange of E₁ and E₂, showing that the relative contribution of the latter increases with the excess energy. Dynamical effects of the energy on ag are also noticeable in the measurements with equal sharing.
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Lablanquie et al. (1995) studied this question.
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