Journal ArticleDOI
A technique for efficiently generating bimetallic clusters
TLDR
In this paper, a dual rod laser vaporization source coupled to a fast flow reactor is developed for the study of bimetallic clusters and their reactions, where the beam from the laser is split and then focused onto each rod, allowing the mixing ratio within the cluster to vary by altering the laser fluence on each rod.Abstract:
Reactivities of bimetallic clusters can be controlled by varying their composition, making them potentially valuable as catalysts and for use in elucidating the reactivities of such subnanoscale surfaces. A dual rod laser vaporization source coupled to a fast flow reactor is developed for the study of bimetallic clusters and their reactions. In order to establish the versatility of the technique, the results of studies are presented in which Nb/Al clusters are formed in two plasmas induced by the second harmonic (532 nm photons) of a single Nd:YAG laser and then detected by a quadrupole mass spectrometer. The beam from the laser is split and then focused onto each rod, allowing the mixing ratio within the cluster to vary by altering the laser fluence on each rod. With a low fluence on the Nb rod and a high fluence on the Al rod, an Al rich cluster distribution is formed, NbAlm− (m=2–20), and Alm− (m=5–31). By increasing the fluence on the Nb rod and decreasing the fluence on the Al rod, a Nb rich cluster ...read more
Citations
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Journal ArticleDOI
Clusters, Superatoms, and Building Blocks of New Materials†
A. W. Castleman,Shiv N. Khanna +1 more
TL;DR: The physical and chemical properties of cluster systems at the subnano and nanoscale are often found to differ from those of the bulk and display a unique dependence on size, geometry, and composition as mentioned in this paper.
Journal ArticleDOI
Cluster-surface interaction: From soft landing to implantation
TL;DR: In this paper, the authors present a review of the field of cluster beam interaction with solids, focusing on the impact phenomena, and discuss the physics of the cluster-surface interaction depending on the kinetic energy.
Journal ArticleDOI
Production of bimetallic clusters by a dual-target dual-laser vaporization source
W. Bouwen,Peter Thoen,Frederik Vanhoutte,Steven Bouckaert,Florin Despa,Horst Weidele,Roger Silverans,Peter Lievens +7 more
TL;DR: In this paper, a dual-target dual-laser vaporization source for the production of binary metallic clusters was presented, where the mixing process was achieved by varying the delay time between the firing of the two lasers and their energy densities.
Journal ArticleDOI
Cluster reactivity experiments: Employing mass spectrometry to investigate the molecular level details of catalytic oxidation reactions
TL;DR: Using GIB-MS to investigate the molecular-level details of oxidation reactions occurring on the surfaces of heterogeneous catalysts via cluster reactivity experiments, it is suggested that the enhanced oxidation reactivity of these stoichiometric clusters may be due to the presence of radical oxygen centers (W–O●) with elongated metal–oxygen bonds.
Journal ArticleDOI
Soft landing of complex molecules on surfaces.
TL;DR: This review discusses the fundamental aspects of soft and reactive landing of mass-selected ions on surfaces that pertain to applications of these techniques in biomaterials, molecular electronics, catalysis, and interfacial chemistry.
References
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Book ChapterDOI
Flowing Afterglow Measurements of Ion-Neutral Reactions
TL;DR: This chapter describes the experimental and analytical techniques that have been developed for flowing afterglow applications to the quantitative study of ion–neutral reaction processes, and the dc discharge was found to be advantageous.
Journal ArticleDOI
Improved pulsed laser vaporization source for production of intense beams of neutral and ionized clusters
Paolo Milani,Walt A. deHeer +1 more
TL;DR: In this article, an improved laser vaporization source for production of intense and stable cluster beams is described. But this source is not suitable for electric deflection studies of highly collimated cluster beams.
Journal ArticleDOI
Aluminum cluster reactions
TL;DR: In this article, aluminum clusters were produced using laser vaporization and reacted under thermal conditions with oxygen in a flow tube reactor, and an etching reaction was observed and bimolecular rate constants were reported for Al+n, n=1-33, and Al−n n=5-37.
Journal ArticleDOI
Structural and dynamical properties of Cu–Au bimetallic clusters
TL;DR: In this article, the effect of alloying on the structural and thermal properties of Cun−xAux (n=13,14) clusters is investigated by constant energy molecular dynamics simulations.
Journal ArticleDOI
Ionization potentials of aluminum–sodium bimetallic clusters (AlnNam)
TL;DR: In this paper, the ionization potentials of the aluminum-sodium bimetallic clusters (AlnNam, n=2-26) were measured up to m=3 using a tunable ultraviolet laser combined with time-of-flight (TOF) mass spectrometer.