We’ve Measured The Smallest Ever Forces Between Atoms

Cast your mind back to high school chemistry and you might remember the van der Waals force: The weak bond between molecules, caused by the way their electrons shift at the atomic level. Now, for the first time, those tiny forces have been measured between two atoms.

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CrazyNeutrino said:

We’ve Measured The Smallest Ever Forces Between Atoms

Cast your mind back to high school chemistry and you might remember the van der Waals force: The weak bond between molecules, caused by the way their electrons shift at the atomic level. Now, for the first time, those tiny forces have been measured between two atoms.

more…

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researchers from the Swiss Nanoscience Institute and the University of Basel wanted to measure these forces between single atoms. To do that, they embedded different noble gas atoms — including argon, krypton and xenon — into a molecular grid made of copper atoms. The team refers to the voids within these grids as “nano-beakers of copper atoms in which the noble gas atoms are held in place like a bird egg.”

Then, using an atomic force microscope, the team was able to measure the small changing forces between the noble gas atoms when they were placed at different distances from each other. When comparing their measurements to those predicted by theoretical calculations, the team found their results to be broadly consistent — though there were instances where the forces between xenon atoms were twice what was expected.