TRIPLE DIFFERENTIAL CROSS-SECTION MEASUREMENTS IN H-2 AND D-2

Triple differential cross sections (TDCS) for double photoionization i n H-2 and D-2 (for comparison also in helium) have been measured for e qual energy sharing, E-1 = E-2 = 10 eV. In agreement with previous obs ervations by the Reddish group and in comparison to the equivalent hel ium case, our D-2 data confirm a 'narrowing' effect in the correlation factor which influences the observed TDCS lobes, as well as a 'fillin g-in' effect at relative angles theta(1,2) = 180 degrees. However, we do not confirm the previous differences in the magnitude of D-2 and H- 2 TDCS values. Instead, we get equal TDCS strengths and, in comparison to helium, reasonable agreement with the corresponding total cross se ction ratio for double photoionization in He and D-2.