Journal ArticleDOI
Preparation and photoionization potentials of molecules of sodium, potassium, and mixed atoms
TLDR
In this article, photoionization near the threshold allows identification of Naxx?16, Kxx?12, and NaxKyx+y?6, which is the longest contiguous series of any property as a function of cluster size.Abstract:
In supersonic nozzle beams of sodium, potassium, and Na/K molecular aggregates Mx have been investigated by several techniques based on mass spectrometry. By electron impact ionization with energy of 20 eV clusters with x≳4 are not observable. Photoionization near the threshold allows identification of Naxx?16, Kxx?12, and NaxKyx+y?6. Single photon ionization thresholds for Naxx?14 are given, this being the hitherto longest contiguous series of any property as a function of cluster size. For Kxx?8 and for 8 Na/K mixed clusters PI thresholds are similarly determined. Very accurate two photon photoionization thresholds for Na2 and K2 have been obtained. Theoretical models of metal clusters from recent publications are not able to adequately interpret the electronic properties of these particles as reflected by the ionization potentials.read more
Citations
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Quantitative Determination of the Raman Enhancement of Ag30(CO)25 and Ag50(CO)40 Matrix Isolated in Solid Carbon Monoxide
TL;DR: In this article, size-selected Ag clusters in the range Ag3-Ag50 were prepared by sputtering a silver substrate, mass-selecting Ag cation clusters using a Wien filter, neutralizing and matrix-isolating them at cryogenic temperatures in solid CO.
Journal ArticleDOI
Ionization potentials in alkali-metal clusters
TL;DR: In this article, the ionization potentials in alkali metal clusters were calculated using a jellium-background model for positive-ion cores and the local spin-density functional approximation for valence electrons.
Journal ArticleDOI
More than Five Percent Ionization Efficiency by Cavity Source Thermal Ionization Mass Spectrometry for Uranium Subnanogram Amounts.
Anne Trinquier,Colin Maden,Anne-Laure Fauré,Amélie Hubert,Fabien Pointurier,Bernard Bourdon,Maria Schönbächler +6 more
TL;DR: The new prototype cavity source TIMS at ETH Zürich offers improvements from 4 to 15 times in combined ionization and transmission efficiency compared to conventional TIMS, yielding up to 5.6% combined efficiency.
Journal ArticleDOI
Evidence for the fragmentation of clusters upon electron impact ionization from electric deflection experiments
A. W. Castleman,Bruce D. Kay +1 more
TL;DR: In this article, a molecular beam electric deflection technique was employed to examine the polarity of the mixed cluster species (H2O)M(SO2)N. The results indicate that the mixed dimer (H 2O).
Journal ArticleDOI
Production and ionization energies of KnF (n = 2–6) clusters by thermal ionization mass spectrometry
Filip M. Veljković,Jasmina Djustebek,M. Veljković,Suzana Veličković,Aleksandra A. Perić-Grujić +4 more
TL;DR: The modified thermal ionization source provides an efficient way of obtaining the fluorine-doped potassium clusters and presents experimental proof that K(n)F (n = 2-6) clusters belong to the group of 'superalkali' species.
References
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Über die Zuordnung von Wellenfunktionen und Eigenwerten zu den Einzelnen Elektronen Eines Atoms
TL;DR: In this paper, Fock's Naherungsmethode zur Behandung des quantenmechanischen Mehrelektronenproblems aufgestellten Gleichungen werden auf etwas allgemeinerer Grundlage diskutiert.
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Size effect on the melting temperature of gold particles
Philippe A. Buffat,JP Borel +1 more
TL;DR: In this article, the melting points of small gold particles have been measured using a scanning electron-diffraction technique and the experimental results are quantitatively in good agreement with two phenomenological models.
Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.