Electron correlations observed through intensity interferometry

Intensity interferometry was applied to study electron correlations in doub ly ionizing ion-atom collisions. In this method, the probability to find tw o electrons emitted in the same double ionization event with a certain mome ntum difference is compared to the corresponding probability for two uncorr elated electrons from two independent events. The ratio of both probabiliti es, the so-called correlation function, is found to sensitively reveal elec tron correlation effects, but it is rather insensitive to the collision dyn amics.