Vortices associated with the wave function of a single electron emitted in slow ion-atom collisions

, which show rich structures for ion scattering angles above 2 mrad arising dominantly from two-electron states. Our calculations reveal that minima in the measured distributions are zeroes in the electronic probability density resulting from vortices in the electronic current. PACS numbers: 34.50.Fa, 34.10.+x Molecular bonds are formed and broken in slow ion-atom collisions on a sub-femtosecond time scale. Upon bond breaking, the electrons forming the bond can be promoted to the continuum where the square of their wave function can be measured. A significant and unexpected electron dynamics in this process was predicted in the 1980