Physicists measure van der Waals forces of individual atoms for the first time

May 13, 2016
Rare gas atoms deposited on molecular network are investigated with a probing tip, which is decorated with a xenon atom. The measurements give information about the weak van der Waals forces between these individual atoms. Credit: University of Basel, Department of Physics

Physicists at the Swiss Nanoscience Institute and the University of Basel have succeeded in measuring the very weak van der Waals forces between individual atoms for the first time. To do this, they fixed individual noble gas atoms within a molecular network and determined the interactions with a single xenon atom that they had positioned at the tip of an atomic force microscope. As expected, the forces varied according to the distance between the two atoms; but, in some cases, the forces were several times larger than theoretically calculated. These findings are reported by the international team of researchers in Nature Communications.

Van der Waals forces act between non-polar atoms and molecules. Although they are very weak in comparison to chemical bonds, they are hugely significant in nature. They play an important role in all processes relating to cohesion, adhesion, friction or condensation and are, for example, essential for a gecko's climbing skills.

Van der Waals interactions arise due to a temporary redistribution of electrons in the atoms and molecules. This results in the occasional formation of dipoles, which in turn induce a redistribution of electrons in closely neighboring molecules. Due to the formation of dipoles, the two molecules experience a mutual attraction, which is referred to as a van der Waals interaction. This only exists temporarily but is repeatedly re-formed. The individual forces are the weakest binding forces that exist in nature, but they add up to reach magnitudes that we can perceive very clearly on the macroscopic scale - as in the example of the gecko.

Fixed within the nano-beaker

To measure the van der Waals forces, scientists in Basel used a low-temperature with a single xenon atom on the tip. They then fixed the individual argon, krypton and in a molecular network. This network, which is self-organizing under certain experimental conditions, contains so-called nano-beakers of copper atoms in which the atoms are held in place like a bird egg. Only with this experimental set-up is it possible to measure the tiny forces between microscope tip and noble gas atom, as a pure metal surface would allow the noble to slide around.

Compared with theory

The researchers compared the measured forces with calculated values and displayed them graphically. As expected from the theoretical calculations, the measured forces fell dramatically as the distance between the atoms increased. While there was good agreement between measured and calculated curve shapes for all of the noble gases analyzed, the absolute measured forces were larger than had been expected from calculations according to the standard model. Above all for xenon, the measured forces were larger than the calculated values by a factor of up to two.

The scientists are working on the assumption that, even in the noble gases, charge transfer occurs and therefore weak covalent bonds are occasionally formed, which would explain the higher values.

The international team of scientists from Switzerland, Japan, Finland, Sweden and Germany used the experimental set-up above to measure the smallest forces ever detected between individual . In doing so, the researchers have demonstrated that they can still push ahead into new fields using atomic force microscopy, which was developed exactly 30 years ago.

Explore further: Van der Waals force re-measured: Physicists verify nonlinear increase with growing molecular size

More information: Nature Communications, DOI: 10.1038/ncomms11559

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Da Schneib
5 / 5 (4) May 14, 2016
This is great stuff. I'd like to see some experiments to verify the charge transfer hypothesis; no doubt we'll see something soon. Prying this stuff apart and figuring out how it all works is vital to both materials science and nanotechnology.
2.3 / 5 (3) May 14, 2016
A day late and a dollar short. The attractive force between atoms was solved and the results published in 1997 ("The Secret of Gravity") wherein the atom force between two atoms vary as the inverse square of the distance between them. It is good to see verification!

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