The STM, scanning tunneling microscope, shows

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STM is used to visualize the outer boundary surface of electrons in an atom. It works on the principle of quantum tunneling, where a very fine tip is brought very close to the surface of the sample being examined, and a current is passed between the tip and the sample. This current is sensitive to the surface topography and electronic structure of the sample, and this information is used to create an image of the sample surface at atomic resolution. The STM can provide information about the electron density of the sample and can be used to study the electronic structure of surfaces, adsorbates, and thin films. It does not provide information about the mass of the nucleus, the number of excited electrons, or the charge on the nucleus.

The STM, Scanning Tunneling Microscope, Shows