An extensive study of the threshold law for the cross section of double photoionization in helium is presented. It provides quantitative information about the Wannier exponent {α}, which agrees with the theoretical prediction. In addition, the hitherto unknown constant of proportionality σ₀ for the cross section σ⁺⁺ was determined as well as the energy range of validity, which was found to be smaller than expected.
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Kossmann et al. (1988) studied this question.
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