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  • 36.40 + d  (2)
  • 36.40.+d  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscopy and spectroscopy for cluster and small particle research (1991)
    Springer
    The European physical journal 19 (1991), S. 287-292 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 + d ; 73.40 Gk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Scanning tunneling microscopy (STM) and spectroscopy (STS) are new methods to investigate atomic arrangements and electronic structures of clusters and small particles of atoms. In this paper we review recent developments in this field, in particular the work from our laboratory. We show studies of single adatoms, small clusters and larger particles of platinum and a trimer of aluminum imaged with atomic resolution on highly-orient ed pyrolytic graphite. We find different isomeric structures for clusters of a specific size. Taking the substrate lattice as reference we determine bond lengths and angles for the clusters. We find that adsorbed Pt-particles have a strong influence on the substrate. Periodic charge density modulations on the graphite lattice surrounding the particles are observed. We also discuss recent STS experiments which showed Coulomb blockade in electron tunneling. A silicon-oxide-graphite tip-junction is used where a mesoscopic insulating area containing trap levels for temporary electron storage is responsible for the blockade of single electron transport. Such an ultra-small insulator capacitor shows large voltage steps in current-voltage characteristics and quantization of the tunneling current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448313
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A scanning tunneling microscope study of single platinum atoms, platinum dimers and trimers on highly-oriented pyrolytic graphite (1991)
    Springer
    The European physical journal 19 (1991), S. 319-321 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 + d ; 61.16.Di
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report a topographic study of platinum clusters on highly-oriented pyrolytic graphite (HOPG) using a scanning tunneling microscope operating in air. The particles were produced by evaporation of platinum onto the graphite-surface in high vacuum. The simultaneous finding of single platinum atoms, clusters and small particles on an otherwise clean and atomically flat surface shows that the platinum-HOPG surface interaction is strong enough to yield stable images of Pt atoms and yet is not strong enough to annihilate the Pt-Pt interaction. Small flat platinum clusters on HOPG can be imaged with atomic resolution of the cluster and the surrounding graphite lattice. We show the adsorption site distribution for the monomers. The Pt-dimers show a very broad bond length distribution on graphite with an average of 2.46 Å. We found two types of Pt-trimers, one which is almost linear and one of triangular form. The average nearest neighbour distance of the trimers is 2.61 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448320
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Alkali-hydride water cluster ions (1993)
    Springer
    The European physical journal 26 (1993), S. 204-206 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 81.10.Bk ; 35.20.Wg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a CO2 laser we have desorbed LiOH and NaOH from a solid target into an expanding inert gas jet pulse. Subsequently the beam was ionized by photons from a UV laser. Surprisingly, we observed in mass spectra metal water clusters and metal-hydride water clusters. For the metals M=Li, Na we find that the [M(H2O)n]+ peaks are dominant for small clusters, while for large clusters (n〉20) the [MH(H2O)n]+ peaks are dominant. This indicates that the clathrate (H2O)20 may play an important role in the formation of metallo-water clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429145
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Delayed ionization of IR-laser excited C60 (1993)
    Springer
    The European physical journal 26 (1993), S. 311-313 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 35.20.Wg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a pulsed CO2 laser we have desorbed C60 clusters from a solid target into an expanding He jet, coupled to a time-of-flight mass spectrometer. We observed self ionization of the excited clusters with a time delay of 120 ±20 µs. This is large compared to previously reported delays of up to 15 µs after laser excitation with visible or ultraviolet light. We suggest that the delayed ionization is caused by structural isomers of hot C60 clusters differing from the truncated-icosahedron structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425700
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    Paper (German National Licenses)
    Fulltext
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