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  • 36.40  (46)
  • Springer  (46)
  • American Association for the Advancement of Science
  • Elsevier
  • 1985-1989  (46)
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Keywords
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  • Springer  (46)
  • American Association for the Advancement of Science
  • Elsevier
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Experimental study of the dissociation of 100–600 keV hydrogen cluster ions in an argon gas target (1986)
    Springer
    The European physical journal 2 (1986), S. 87-90 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the break-up of accelerated hydrogen cluster ions passing through an argon gas target. The absolute dissociation cross section has been measured for a wide variety of H n + (odd masses only) cluster ions, withn between 5 and 23 and with projectile velocities ranging from 1.5 to 5 × 108 cm/s. We discuss the dissociation processes and the dependence of their cross-sections upon the cluster mass and velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437246
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  • 2
    Electronic Resource
    Electronic Resource
    Physical properties of high-nuclearity metal cluster compounds (1989)
    Springer
    The European physical journal 12 (1989), S. 445-450 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 75.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Metal cluster compounds are composed of large macromolecules, which consist of a metal core (cluster) containing a certain number (n=6–560) of metal atoms, to which core a shell of ligands is coordinated. They provide excellent model systems for an assembly of identical metal clusters, embedded in a dielectric matrix. We discuss a number of physical properties of these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426993
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic and atomic structure of Na, Mg, Al and Pb clusters (1988)
    Springer
    The European physical journal 11 (1988), S. 163-174 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 31.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Density functional theory is used to study the electronic and atomic structure of small clusters of Na, Mg, Al and Pb. We study the quantityE N−1–E N , which has relevance to the processes of cluster growth and evaporation (E N is the total energy of the cluster withN atoms). By comparing the results of the jellium model with those of a more realistic model (although still simple) we are able to appreciate “structural” effects beyond the “electronic-shell effects” which form the essence of the predictions of the jellium model. The calculations predict formation of atomic shells and appreciable reconstruction as the cluster grows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01444433
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of dispersion on the energies of adsorption: H2, CO, propylene and propyne on supported Pd or Pt (1989)
    Springer
    The European physical journal 12 (1989), S. 583-586 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 82.65.Jv ; 82.60.Cx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The aim of this work is to contribute to an explanation of thelowering of the specific activity of Pd/Al2O3 catalysts, towards hydrogenation of acetylenic molecules,as the dispersion increases. For this purpose, the interaction energy between these catalysts and H2, CO, propylene and propyne was directly measured by adsorption microcalorimetry at 323 K. In the case of propyne, the enthalpy of adsorption was found to be more than 50% higher for the catalysts with 97% dispersion than for the one with 26% dispersion, for coverages ranging from 0.2 to 0.7.This high enthalpy of adsorption (up to 290 kJ.mol−1) is attributed to a different proportion of edges and crystalline planes in the smallest Pd crystallites and is indeed consistent with a “blocking”chemisorption or with a hindered desorption of the products of a catalytic hydrogenation, i.e. with a lowering of the specific activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427023
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  • 5
    Electronic Resource
    Electronic Resource
    Size-dependent thermodynamic properties of silver aggregates. Simulation of the photographic development process (1989)
    Springer
    The European physical journal 12 (1989), S. 31-35 
    Details
    ISSN: 1434-6079
    Keywords: 82.50 ; 36.40 ; 35.20.V
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pulse radiolysis and time-resolved optical spectroscopy were used to observe the earliest steps of silver aggregation in the presence of an electron donor whose electrochemical potential is close to those of usual photographic developers. A critical size has to be reached by the silver aggregate before it is thermodynamically able to accept electrons from the donor, then to grow by an autocatalytic process with alternate adsorption of Ag+ ions and electron scavenging. From a computer simulation the critical aggregation numbern c is found to be 4 and hence the electrochemical potential of the critical aggregate is ≈−0.4 V/NHE. The size-dependence of the electrochemical potential in an aqueous solution is discussed and compared with that of the ionization potential in the gas phase. A tentative extrapolation of the present interpretation to the mechanism of the photographic development is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426900
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  • 6
    Electronic Resource
    Electronic Resource
    Stability of alkali-atom clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 199-203 
    Details
    ISSN: 1434-6079
    Keywords: 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A detailed study of the stability of alkali-atom clusters is presented and discussed. Free clusters are produced in an unseeded adiabatic expansion and ionized by a pulsed laser beam. A tandem time-of-flight system provides a size selection of ionized species and mass spectrometry of fragments. We have investigated for sodium and potassium clusters containing up to fifty atoms: the metastable decay following ionization, the photo-induced dissociation, the collisional induced dissociation and the collisional charge exchange. Experimental evidence is shown for dissociative process involving evaporation of monomers and dimers. This is explained by the statistical unimolecular theory and by the energetics of the systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426937
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  • 7
    Electronic Resource
    Electronic Resource
    Binding energy of large icosahedral and cuboctahedral Lennard-Jones clusters (1989)
    Springer
    The European physical journal 12 (1989), S. 69-71 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 61.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is widely believed that the lowest energy configurations for small rare gas clusters have icosahedral symmetry. This contrasts with the bulk crystal structures which have cuboctahedral fcc symmetry. It is of interest to understand the transition between this finite and bulk behavior. To model this transition in rare gas clusters we have undertaken optimization studies within the Lennard-Jones pair potential model. Using a combination of Monte Carlo and Partan Search optimization methods, the lowest energy relaxed structures of Lennard-Jones clusters having icosahedral and cuboctahedral symmetry were found. Studies were performed for complete shell clusters ranging in size from one shell having 13 atoms to 14 shells having 10,179 atoms. It was found that the icosahedral structures are lower in energy than the cuboctahedral structures for cluster sizes having 13 shells or fewer. Additional studies were performed using the more accurate Aziz-Chen [HFD-C] pair potential parameterized for argon. The conclusions appear to be relatively insensitive to the form of the potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426907
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  • 8
    Electronic Resource
    Electronic Resource
    Coulomb explosion of charged jellium clusters (1989)
    Springer
    The European physical journal 11 (1989), S. 323-326 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 31.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Density Functional Formalism is used to calculate the minimum number of atoms (N c ) a multiply charged jellium-like spherical cluster must contain to be stable against coulomb explosion into two smaller fragments. In the case of alkaline clusters, which are systems for which the jellium model can be applied, we findN c equal to 31 and 23 for the explosion of Na N 2+ and Cs N 2+ respectively, in good agreement with the experimental value ofN c = 18 for Cs N 2+ . Calculated critical numbers for triply and tetracharged Cs clusters are 108 and 323 respectively. In addition the model predicts that the most favourable fragmentation channel is the ejection of a singly charged monomer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438506
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  • 9
    Electronic Resource
    Electronic Resource
    Enrichment and segregation in alkali heteroclusters (1989)
    Springer
    The European physical journal 12 (1989), S. 237-239 
    Details
    ISSN: 1434-6079
    Keywords: 31.20 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A spherical average pseudopotential method (SAPS) is used to investigate some properties of compound alkali clusters. The effect that the substitution of a Sodium atom by a Lithium atom in a Na n cluster has on the stabilities and geometries is studied forn≤21. We have found that substitution is always energetically possible. On the other hand equiatomic Na n Cs n clusters are considered in the size rangen≤16. We find a strong segregation effect of the Cesium atoms towards the cluster surface. This agrees with what happens in liquid Na x Cs1−x alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426946
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  • 10
    Electronic Resource
    Electronic Resource
    NMR of metal-core bonded31P in polynuclear metal cluster compounds (1989)
    Springer
    The European physical journal 12 (1989), S. 451-452 
    Details
    ISSN: 1434-6079
    Keywords: 76.60 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we present measurements of nuclear relaxation times of31P in the polynuclear cluster compounds Au55(PPh3)12Cl6 and Ru55(P(t-Bu)3)12Cl20. Above 15 K the data can be described as a Korringa process, while below 15 K the relaxation time appears to be thermally activated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426994
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