E. Eremina, X. Liu, H. Rottke, W. Sandner, A. Dreischuh, M. G. Schätzel, G.G. Paulus, H. Walther, R. Moshammer, J. Ullrich
The electron momentum correlation after non-sequential double ionization of N2 and O2 in ultrashort light pulses at light intensities near 1.5x1014 W/cm2 has been investigated. The experimental results reveal distinctive differences between the molecular species and between molecules and atoms of similar ionization threshold. We provide evidence that recollision double ionization is the essential mechanism and trace the origin of the differences back to the symmetry of the orbitals of the leuchtelectrons.