Reactions of iron clusters with hydrogen. II. Composition of the fully hydrogenated products
- 15 June 1985
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 82 (12) , 5470-5474
- https://doi.org/10.1063/1.448581
Abstract
Reactions of iron clusters with an excess of hydrogen are found to yield fully hydrogenated products FenHm whose compositions remain fixed over a wide range of hydrogen pressures. For n=6 to 131, the observed m values are always even, have narrow ranges, and for many clusters are unique. Up to n=30, nearly stoichiometric 1:1 ratios of m to n are found. Above 30, cluster hydride compositions are consistent with a monolayer of chemisorbed hydrogen on the cluster surfaces. At sufficiently high hydrogen pressures additional hydrogens bind to the clusters, most likely as a second, physisorbed layer. The experimental results are discussed in terms of cluster structure and the relation to bulk iron behavior.Keywords
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