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Reviving Young's slits in an atom

There has always been a desire to understand quantum mechanics in terms of classical physics. Quantum analogues of Young's double-slit experiment from classical optics have been fundamental to our understanding of the wave nature of particles and double-slit interference patterns have been observed with beams of electrons and atoms. Now, Michael Noel and Carlos Stroud of the University of Rochester in the US have observed double- slit-like interference phenomena in electron wave packets within a single atom (M W Noel and C S Stroud 1995 Phys. Rev. Lett. 75 1252).