About this book The theory of the chemical interaction of molecules with surfaces has advanced handsomely in the last few years. Show all.
Electronic Theory of the Chemisorption and Catalytic Reactions on Metal Surface
Cluster Chemisorption Pages Kunz, A. Show next xx. Read this book on SpringerLink. Recommended for you. PAGE 1. Newns D. Margulis Vl. Physica B 1—2 , P. Veziroglu et al. Gadzuk J. Ando T. Margulis 1 E.
Muryumin 2 1. Department of Physics N. Department of Chemistry N. In the same way the need of society drives the human porcupines together, only to be mutually repelled by the many prickly and disagreeable qualities of their nature.
The Physics Nobel laureate Richard Feynman reported a similar phenomenon for the very basic building blocks of matter, the atoms. However, the nature of the interaction of atoms and molecules with surfaces is even more complex as was already found by the physicist Lenard-Jones back in In some cases, two modes of bonding can occur: a weak bonding, called physisorption and a strong bonding, called chemisorption.
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Physisorption makes dust stick to surfaces or allows geckos to walk on walls and ceilings without falling off. Chemisorption is ten to one hundred times stronger than physisorption. The interplay between physisorption and chemisorption is crucial for the cleaning of exhaust gas in catalytic converters of cars and in industrial reactors that build basic chemicals by catalytic reactions.
The two modes of adsorption are expressed by an energy curve that shows two minima. Those energy curves have been displayed in textbooks of physical chemistry and surface science for decades, although experimental access had been limited to the equilibrium points where physisorption and chemisorption occur.
Electronic Theory of Chemisorption
Giessibl have been able to experimentally record the genesis of the energy curve that is involved in the transition from physisorption to chemisorption. They achieved this by attaching a CO molecule to the tip of an atomic force microscope and moving it towards a single iron atom that sits on a copper surface while recording the force that acted in the process.
Overcoming the energetic barrier between physisorption and chemisorption requires a rearrangement of the electrons hybridization that make up the bonds as has been confirmed in the quantum chemical calculations. Returning to Schopenhauer and human relationships, it is not unheard of that humans can also become highly attracted after overcoming possible initial repulsion.
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go here Modern electronics relies on ultrafast charge motion on ever shorter length scales. Physicists from Regensburg and Gothenburg have now succeeded in resolving a key quantum motion of electrons in atomically thin crystals on the time scale of a single oscillation cycle of light. They directly
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