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  • 36.40  (2)
  • Life and Medical Sciences  (1)
  • 1985-1989  (3)
  • 1935-1939
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  • 1
    Electronic Resource
    Electronic Resource
    Structure of Ag, Fe and Ge microclusters (1989)
    Springer
    The European physical journal 12 (1989), S. 103-105 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The structures of Ag, Fe and Ge microclusters were determined using EXAFS. The measurements were performed over a wide range of clusters sizes. The clusters were prepared using the gas aggregation technique and isolated in solid argon at 4.2 K. The measurements were performed at the National Synchrotron Light Source (NSLS) at beam line X-18B. A strong contraction of the interatomic distances was observed for Ag dimers and multimers. Silver clusters larger than 12 A mean diameter show a small contraction of thenn distance and a structure consistent with an fcc lattice. By contrast clusters smaller than 12 A show the presence of a small expansion and a strong reduction or absence ofnnn in the EXAFS signal. This points towards a different crystallographic structure for Ag microclusters with diameter less than 12 A. In iron clusters we observe a gradual reduction of thenn distance as the cluster size decreases. The interatomic distance for iron dimers was determined to be 1.94 A, in good agreement with earlier measurements. The iron microclusters show a bcc structure down to a mean diameter of 9 A. Iron clusters with 9 A mean diameter show a structure inconsistent with a bcc lattice. The new structure is consistent with an fcc or hcp lattice. The measurements on Ge clusters show the presence of only nearest neighbors. There was clear evidence of temporal annealing as determined by variations in the near edge structure of the K-absorption edge. Absorption edge measurements were also performed for free Ge clusters travelling perpendicular to the direction of the synchrotron radiation beam. The measurements performed on the free clusters were consistent with those obtained for matrix isolated clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426915
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  • 2
    Electronic Resource
    Electronic Resource
    Stability of multiply charged silver clusters (1987)
    Springer
    The European physical journal 4 (1987), S. 379-381 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 35.20X ; 79.20K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the gasaggregation technique it is possible to generate metal clusters in narrow size distributions and to vary their mean size by adjusting the cell parameters. The high intensity of this source allows to detect besides singly charged clusters also multiply charged ones. Ag n 2+ and Ag n 3+ are observed forn≧9 andn≧31, respectively; i.e. at values well below the critical sizes reported for spheres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01384891
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  • 3
    Electronic Resource
    Electronic Resource
    Hermann Müller. Briefwechsel mit Charles Darwin. Hrsg. v. H. Kresse. Lippstadt 1985. Zu beziehen vom Herausgeber: Ostendorf-Gymnasium, D-4780 Lippstadt. DM 8,- (1988)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 18 (1988), S. 159-159 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19880180511
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