Articles you may be interested inTheoretical studies of the structure and dynamics of metal/hydrogen systems: Diffusion and path integral Monte Carlo investigations of nickel and palladium clusters Tworeagent reactions of iron clusters with ammonia and deuterium: Saturated compositions and the kinetics of reactions of deuterium with ammoniated clusters J. Chem. Phys. 90, 1526 (1989); 10.1063/1.456095Chemical probes of metal cluster structure: Reactions of iron clusters with hydrogen, ammonia, and waterThe kinetics of the gas phase reactions of hydrogen and deuterium with iron clusters in the range Fe 6 to Fe 68 have been investigated. It is found that reaction rate constants are a strong function of cluster size, varying by more than four orders of magnitude in this size range. The largest rate constants correspond to approximately 3 % of a hard sphere cross section. Abrupt changes in the rate constant from one cluster to the next are seen. Qualitative temperature dependencies of cluster reactivity have been determined. The more reactive clusters show decreased reactivity with increased temperature, while the least reactive clusters become more reactive. Strong isotope effects are seen only in the FelO to Fe!4 size range. Mechanisms for the reactions ofH 2 and O 2 with iron clusters are discussed in light of these observations.
Articles you may be interested inEquilibrium structure and bonding of small iron-carbon clusters Magic numbers through chemistry: Evidence for icosahedral structure of hydrogenated cobalt clusters J. Chem. Phys. 92, 2110 (1990); 10.1063/1.458045 Tworeagent reactions of iron clusters with ammonia and deuterium: Saturated compositions and the kinetics of reactions of deuterium with ammoniated clusters J. Chem. Phys. 90, 1526 (1989); 10.1063/1.456095The uptake of ammonia by iron clusters: A new procedure for the study of metal cluster chemistry Evidence is presented for structural changes in iron clusters in the Fe J3 to Fe 23 size range. Abrupt changes with cluster size are found for several chemical properties, including reactivity with hydrogen and binding energies of ammonia and water. These changes often come at the same cluster sizes, pointing to a common origin-fundamental changes in the structure of the bare iron clusters. In addition, changes in structure as a consequence of adsorbate binding are suggested. The experimental observations leading to these conclusions are detailed, and possible structures for clusters in this size range are proposed.1622
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.
On the iron oxide neutral cluster distribution in the gas phase. I. Detection through 193 nm multiphoton ionization Neutron scattering study of the spin waves and magnetic structures in pure and metaldeficient V2O3
Generation of continuous beams of clusters of refractory metals by a thermal quench flow source is described.The source consists of a high-temperature (up to 2000 °C) oven for metal vaporization and a liquid-nitrogen-cooled quench cell for condensation and cluster growth. Various flow gases are used to vary the distribution of clusters produced. The operation of the source and the characterization of cluster beams of Al, Cr, Ni, Cu, and Ag are discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.