Molecular beams

Molecular beams can be created by making a tiny hole in a mostly vacuum. The resulting streams of particles forms tight beams, behaving like tiny magnets. This discovery supported quantum mechanics and demonstrated wave aspects in molecular beams.
 Otto Stern United States 1933 Molecular beams

Molecular beams can be created by making a tiny hole in a mostly vacuum. The resulting streams of particles forms tight beams, behaving like tiny magnets. This discovery supported quantum mechanics and demonstrated wave aspects in molecular beams.