Interference patterns in the scattering of positrons and electrons by
diatomic homonuclear molecules are ab initio calculated. Our results are
compared to model potential calculations with incident particles in
twisted and plane wave states. All calculations are obtained in the
first Born approximation framework. The comparison of the elastic
differential cross sections shows how an ab initio description of the
electronic molecular structure influence the interference minima
structure. The origin of such patterns are also discussed.