Journal ArticleDOI
Photoionization studies of niobium clusters: Ionization potentials for Nb2–Nb76
Mark B. Knickelbein,Shihe Yang +1 more
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TLDR
The photoionization efficiency (PIE) spectra for Niobium clusters up to Nb76 were measured using laser ionization time-of-flight mass spectrometry as discussed by the authors.Abstract:
The photoionization efficiency (PIE) spectra for niobium clusters up to Nb76 are measured using laser ionization time‐of‐flight mass spectrometry Ionization potentials (IPs) assigned from the PIE spectra evolve with the same general pattern observed for other transition metal clusters (Mn) studied to date: a rapid yet nonmonotonic decrease in IP to n≂15 followed thereafter by a relatively slow and smooth evolution The measured IPs evolve with cluster radius R according to the predictions of the conducting spherical droplet model if the limiting (R→∞) IP is chosen to be 05 eV lower than the bulk polycrystalline work function Kinetics experiments using D2 as the coreactant indicate the existence of two structural forms, one highly reactive, one relatively unreactive for clusters in the size range Nb9–Nb12, with the reactive forms predominant in each case PIE spectra for Nb9–Nb12 were recorded using sufficient D2 added to the cluster source to selectively titrate the reactive forms of these clusters, leread more
Citations
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Journal ArticleDOI
Reactions of transition metal clusters with small molecules.
TL;DR: Although polyatomic transition metal clusters cannot be characterized by the traditional methods of molecular spectroscopy, the combination of other physical and chemical probes can provide qualitative and semiquantitative structural information.
Journal ArticleDOI
Reactions and thermochemistry of small transition metal cluster ions
TL;DR: This review discusses the reactivities and thermodynamics of small-size-specific transition metal clusters and focuses on thermodynamic information, which has not been comprehensively discussed before.
Journal ArticleDOI
Delayed ionization and fragmentation en route to thermionic emission: statistics and dynamics.
TL;DR: Thermionic emission is discussed as a long time (microseconds) decay mode of energy-rich large molecules, metallic and metcar clusters, and fullerenes and theoretical indications of a not-quite-statistical delayed ionization and to the competition of electron emission with other decay modes, such as fragmentation or radiative cooling.
Journal ArticleDOI
Methane activation by platinum cluster ions in the gas phase: effects of cluster charge on the Pt4 tetramer
Uwe Achatz,Christian Berg,Stefan Joos,Brigitte S. Fox,Martin K. Beyer,Gereon Niedner-Schatteburg,Vladimir E. Bondybey +6 more
TL;DR: In this article, the reactions of cationic and anionic platinum clusters Pt ± n, n = 1−9, with methane CH 4 were investigated under single collision conditions in a Fourier-Transform Ion Cyclotron Resonance Mass Spectrometer.
Book ChapterDOI
Gas-phase thermochemistry of transition metal ligand systems: reassessment of values and periodic trends
TL;DR: In this paper, the authors examined the periodic trends in transition metal thermochemistry where the identity of the metal is systematically varied while maintaining the same ligands, and how the bond energies change as the number of ligands on the metal was systematically increased.
References
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Journal ArticleDOI
Photoelectric work functions of transition, rare-earth, and noble metals.
TL;DR: In this article, photoelectric work functions of polycrystalline films of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Pd, Ag, La, Ce, Nd, Sm, Eu, Gd, Hf, Pt, and Au are reported.
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Physics and Chemistry of Small Clusters
TL;DR: In this article, the physical and chemical properties of solid clusters are discussed, including atomic and electronic structure, dynamics, stability, fragmentation, optical properties, interaction with adsorbates, astrochemistry and van der Waals forces of clusters.
Journal ArticleDOI
Surface reactions of metal clusters. II. Reactivity surveys with D2, N2, and CO
TL;DR: In this article, a survey study of the reactivity of transition metal clusters in contact with low concentrations of D2, N2 and CO is presented. But the detailed pattern of reactivity differing markedly for each metal.
Journal ArticleDOI
Extended X-Ray—Absorption Fine Structure of Small Cu and Ni Clusters: Binding-Energy and Bond-Length Changes with Cluster Size
TL;DR: In this paper, extended x-ray-absorption fine-structure measurements have been made on metal clusters of Cu and Ni which were formed by vapor deposition on amorphous carbon substrates.
Journal ArticleDOI
Correspondence between electron binding energy and chemisorption reactivity of iron clusters.
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