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  • 36.40. + d  (83)
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  • 1
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 34.60. + z ; 34.70 + e ; 35.20.Wg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron transfer from state-selected Ar**(n d) Rydberg atoms to N2O clusters has been studied over a broad range of principal quantum number (10 ≦n ≦ 45) and at two different Ar velocities (560 and 1000 m/s). A strongn-dependence of the negative cluster ion spectra is detected: while at highn ≳ 30, a rather narrow distribution of (N2O) q ·O− and (N2O) q − ions around the major product (N2O)6·O− is found, the distribution widens considerably towards largerq for decreasingn. Correspondingly, the effective rate constants for (N2O) q ·O− and (N2O) q − formation show very differentn-dependences for lowq ≦ 6 and higherq. Possible reasons for the observed behaviour are discussed.
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  • 2
    ISSN: 1434-6079
    Keywords: 71.45.-d ; 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theoretical study of collective excitations in deformed metal clusters is presented. Sum rules are used to study the splittings of the dipole surface plasma resonance originating from the cluster deformation. The vibrating potential model is developed and used to predict the occurrence of a low lying collective mode of orbital magnetic nature.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 19 (1991), S. 311-313 
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 61.16.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigated the growth of small gold particles on thin alumina substrates obtained by oxidation of aluminum. The particles were vapor deposited in vacuum from a Knudsen cell source with a vapor rate of 1·1013 cm−2·s−1. In our experiments small Au particles on Al2O3 were examined by electron microscopy. From electron micrographs we draw a size histogram of Au particles depending on the mean deposit thickness and the deposition rate. For a mean thickness larger than 1.5 nm the particle size distributions show two peaks. The shapes and the positions of these two peaks allow us to determine the particle growth mechanism and to evidence the importance of the liquid-like coalescence resulting of diffusion and collision of the aggregates.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 19 (1991), S. 337-342 
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 82.20.Pm ; 82.30.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The chemical reactions of size selected silicon cluster ions (containing up to 70 atoms) have been studied with a number of different reagents using injected ion drift tube techniques. Both kinetic and equilibrium measurements have been performed as a function of temperature, and the influence of cluster annealing on chemical reactivity explored. Unlike metal clusters, where bulk behavior appears to be approached with around 30 atoms, large silicon clusters (n up to 70) are much less reactive than bulk silicon surfaces. These results suggest that the clusters in the size range examined here are not small crystals of bulk silicon, but have compact, high coordination number structures with few dangling bonds.
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  • 5
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 35.20. Wg ; 82.65. − i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the surface of supported palladium particles by static secondary ion mass spectrometry (SSIMS). Pd particles were grown in situ on alumi na (oxide layer and sapphire surfaces) and stabilized by heating treatment. The particle size, density and crystallographic structure were determined in previous studies by transmission electron microscopy and diffraction (TEM and TED). Various ionic species are detected by SSIMS analysis which makes it possible to characterize the CO absorbed layer: Pd n CO+ (n=1, 2) for molecular adsorption and Pd n C+ for CO dissociation. The size dependence of the bonding state of CO (linear, bridge, ...) was monitored by: PdCO+/σ n Pd n CO+ signal ratio over various size particles (mean diameter in the 2–9 nm range). Investigations were performed as a function of CO coverage (adsorption at room temperature) and also under CO dissociation conditions: heating under CO atmosphere or CO+O2 (catalysis). The data analysis shows that on clean Pd particles smaller than 3 nm the CO molecules give rise mainly to PdCO+ species. We have interpreted this result by the adsorption of CO on two palladium atoms, the carbon end being tightly bonded to a low coordination Pd atom and the oxygen end weakly bonded to a neighbour Pd atom. These couples of Pd atoms form the specific sites for CO dissociation, the density of which depends on the roughness of the particle surface.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 20 (1991), S. 61-63 
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 79.20.RF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents the results of study of a new phenomenon — the formation of cluster ions of both signs in the scattering of neutral water clusters by solid surfaces and the appearance of a current to the target. The experiments were carried out by the nozzle molecular beam technique. The probabilities of the charge removal from the surface were measured in dependence on incident angle, cluster size, and target material. The model of the process has been proposed which incorporates 1) formation of an ion pair during ion dissociation of a vibrationally excited molecule in a water cluster colliding with the surface; 2) asymmetric neutralization of an ion pair by surface; 3) inertial removal of a cluster ion from the surface. However the measured angular and energy distribution of emitted charged particles testify to more complex mechanisms of ionization and scattering because the spatial pattern of ion emission is of rainbow character and in some cases the direction of inertial removal (along the tangential component of initial velocity) does not dominate.
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  • 7
    ISSN: 1434-6079
    Keywords: 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A tandem time-of-flight mass spectrometer is used to measure photofragmentation mass spectra and optical absorption spectra of mass selected argon cluster ions in then=3 to 108 atoms per cluster range.
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  • 8
    ISSN: 1434-6079
    Keywords: 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photodissociation and photodetachment of negatively charged sulfur dioxide clusters (SO2) n − ,n=2–11, were investigated in the wavelength range from 458 to 660 nm. Electrons obtained from the interaction of photons with clusters were found to be produced in two photon processes forn≥3. Hence their detachment threshold energy is increased by at least 0.7 eV with respect to the dimer. Wavelength dependent depletion spectra indicate that the clusters are composed of a dimer anion chromophore solvated by neutral molecules. The spectral position of the absorption band is maintained and the shape evolves continuously with cluster size. However, a narrowing of the band with increasing cluster size is observed.
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  • 9
    ISSN: 1434-6079
    Keywords: 36.40. + d ; 31.20.Sy ; 65.50. + m ; 63.70. + h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A scheme based in density functional theory with pseudopotentials is used to obtain the normal modes of vibration of Na n clusters (4 ≤n ≤ 22). The monomer and dimer evaporation rates from thermally excited clusters are obtained in this harmonic approximation. The time evolution of the abundance spectra from an initial uniform mass distribution of hot clusters is studied and its influence in the experimentally observed spectra is discussed.
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  • 10
    ISSN: 1434-6079
    Keywords: 36.40. + d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron emission efficiency induced by the collision of clusters with a solid surface was measured as a function of cluster size. Emitted electron energy distribution for the impact of mass selected negative ion clusters or mass selected neutral clusters was also measured in the energy region of 0–5 eV. The difference in the shape of the electron spectra was observed depending on the size and charge of the clusters.
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