Two-Center Interferences in Dielectronic Transitions in H⁺₂ + He Collisions

Molecular two-center interferences in a collision induced excitation of H+2 projectile ions, with simultaneous ionization of helium target atoms, are investigated in a kinematically complete experiment. In the process under investigation, the helium atom is singly ionized and simultaneously the molecular hydrogen ion is dissociated. Different collision mechanisms are identified and interference fringes emerging from a correlated first-order mechanism and from an independent second-order process are observed