Double photoionization of spatially aligned D-2

The four-body breakup of spatially aligned D-2 by 58.8 eV photons from the Advanced Light Source has been investigated by measuring the three dimensio nal momentum vectors of both fragment ions and one of the two electrons in coincidence. Energy and angular correlation between ions and electrons is d iscussed. We find rotational symmetry of the electron angular distribution around the polarization vector of the light and significant differences bet ween helium and D2 as well as between molecular alignment parallel and perp endicular to the polarization axis.