Triple differential cross section measurements in H2 and D2

Triple differential cross sections (TDCS) for double photoionization in H2 and D2 (for comparison also in helium) have been measured for equal energy sharing, E1 = E2 = 10 eV. In agreement with previous observations by the Reddish group and in comparison to the equivalent helium case, our D2 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 θ1,2 = 180 deg. However, we do not confirm the previous differences in the magnitude of D2 and H2 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 D2. (author). Letter-to-the-editor