Chemical bond formation showing a transition from physisorption to chemisorption - PubMed
- ️Tue Jan 01 2019
. 2019 Oct 11;366(6462):235-238.
doi: 10.1126/science.aay3444. Epub 2019 Sep 12.
Affiliations
- PMID: 31515246
- DOI: 10.1126/science.aay3444
Chemical bond formation showing a transition from physisorption to chemisorption
Ferdinand Huber et al. Science. 2019.
Abstract
Surface molecules can transition from physisorption through weak van der Waals forces to a strongly bound chemisorption state by overcoming an energy barrier. We show that a carbon monoxide (CO) molecule adsorbed to the tip of an atomic force microscope enables a controlled observation of bond formation, including its potential transition from physisorption to chemisorption. During imaging of copper (Cu) and iron (Fe) adatoms on a Cu(111) surface, the CO was not chemically inert but transited through a physisorbed local energy minimum into a chemisorbed global minimum, and an energy barrier was seen for the Fe adatom. Density functional theory reveals that the transition occurs through a hybridization of the electronic states of the CO molecule mainly with s-, p z -, and d z 2-type states of the Fe and Cu adatoms, leading to chemical bonding.
Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.
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