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Wednesday, 30 September 2020
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Raw materials & technologies, Technologies, Nanotechnology

Researchers discover the symmetry of chemical bonding

Friday, 4 May 2012

Nanomolecules can now be defined. Physicists realise the quantitative measurement of the symmetry of chemical bonding. It is the basis to determine the  bonding energy and therefore as well the chemical identity of an atom.

Tomographic maps of bonding forces are provided

Source: Innovari - Fotolia.com

Tomographic maps of bonding forces are provided

Source: Innovari - Fotolia.com

In the future an atlas of forceeffects of atoms could be realised.

The researchers from University Regensburg, Germany, have measured the angular dependence of chemical bonding forces between a carbon monoxide molecule that is adsorbed to a copper surface and the terminal atom of the metallic tip of a combined scanning tunneling microscope and atomic force microscope. The researchers provide tomographic maps of force and current as a function of distance that revealed the emergence of strongly directional chemical bonds as tip and sample approach. The force maps show pronounced single, dual, or triple minima depending on the orientation of the tip atom, whereas tunneling current maps showed a single minimum for all three tip conditions. They introduce an angular dependent model for the bonding energy that maps the observed experimental data for all observed orientations and distances.

The Science magazine provides the abstract

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