This is not the first picture of an atom, nor is it the first picture of atoms from different elements. However, in those older photos, the atoms were arranged beforehand by scientists. But in the Oak Ridge pic, the material was created chemically, and the picture was still able to identify individual atoms.
The material in the photo, called boron nitride, consists of boron, nitrogen, and oxygen, with some carbon atoms inserted in place of boron to serve as a control in the image. The electron scanning microscope that took the picture used a 60 kilovolt beam. That’s a very low energy for this kind of microscope, because if the beam were any more powerful, it would displace some of the atoms in the compound.
Right now, scientists can only determine the chemical arrangements in a material through chemistry. By developing a technique for taking pictures like this, material chemists and engineers of the future will be able to simple look at the chemical compound to see its geometry and composition.
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