How was the Particle Double Slit Experiment really done? To be precise, what kind of double slits were used and how can such slits be small enough, especially for electrons and buckys balls?

  • $\begingroup$ Not exactly a double slit but electron diffraction by crystals is related. In that case the rows of atoms in the crystal act as multiple slits. $\endgroup$ – M. Enns Jan 29 at 15:54
  • $\begingroup$ One can use a wire at high voltage. This acts as a biprism. I think that is how they did C$_{60}$ in Aarhus. $\endgroup$ – Pieter Jan 29 at 15:55

Here is a description of the single electron experiment

tanamura dblslit

This figure from our book “Exploring Quantum Physics Through Hands-On Projects” shows a schematic representation of the modifications that Tonomura made to a transmission electron microscope to develop his experimental setup. Electrons are emitted from a very sharp tungsten tip by applying a potential difference of 3 to 5kV between the tip and a first anode ring through an effect known as “field emission.” These electrons are then accelerated to the second anode potential of 50kV (the de Broglie wavelength for the accelerated electrons is λ=0.0055nm). Assorted “electron optics” within the modified electron microscope attenuate and focus the electron beam so that a current of barely 1,000 electrons per second is beamed towards the double-slit.

The double-slit is actually an extremely fine wire filament (1μm diameter) placed between two conductive plates a centimeter apart. The wire is biased at a positive voltage of 10V relative to the plates. This arrangement is known as an electron biprism.

Italics mine

This link has a video


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