Abstract
The interactions between atoms and small metal clusters are of great significance in the exploration of novel bonding mechanism. We present the strong chemisorption abilities of ultrasmall iron clusters interacting with large numbers of hydrogen and oxygen atoms from first-principles calculations. Geometric structures show that, the maximum numbers of the sequential hydrogen (oxygen) chemisorption on Fe1 to Fe4 clusters can be 11 to 28 (only 5 to 11). Using ab initio molecular dynamics, different kinds of hydrogen diffusion behaviors are found in the FeH systems, and two main types of FeO bonds are addressed in the stable FeO systems.
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