Abstract

Triple differential cross sections (TDCS) for double photoionization in and (for comparison also in helium) have been measured for equal energy sharing, eV. In agreement with previous observations by the Reddish group and in comparison to the equivalent helium case, our data confirm a `narrowing' effect in the correlation factor which influences the observed TDCS lobes, as well as a `filling-in' effect at relative angles . However, we do not confirm the previous differences in the magnitude of and TDCS values. Instead, we get equal TDCS strengths and, in comparison to helium, reasonable agreement with the corresponding total cross section ratio for double photoionization in He and .

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