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  • 1990-1994  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Helium atom scattering from CO adsorbed at steps on Ni(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1435-1441 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Diffraction of helium atoms from randomly distributed step edges on the otherwise smooth (001) surface of Ni has been observed. Measurements for different azimuths near the 〈100〉 direction indicate that the step edges are lined up perpendicular to the 〈100〉 direction. The effect of CO adsorption on both the amplitude of the diffraction oscillations and also on specular scattering has been studied. The in-plane diffraction oscillations from the steps and the specular peak intensity show a similar attenuation with CO adsorption. This is interpreted in terms of a simple model for the effect of adsorption on the step diffraction oscillations. With increasing CO adsorption, the step edge diffraction patterns are also found to be slightly shifted suggesting a continuous change in step edge shape with adsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458102
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evidence for coupled rotational and phonon quantum excitation in the scattering of a nearly monoenergetic HD beam from the Ni(001) surface (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1468-1477 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Angular distributions and time-of-flight spectra of a nearly monoenergetic (Δv/v(approximately-equal-to)2% FWHM) He seeded HD beam (ki=6.80 A(ring)−1, Ei=32 meV) have been measured after scattering from a Ni(001) single-crystal surface along the 〈100〉 azimuth. The most intense peaks in the angular distributions are attributed to diffraction with rotational excitation while the rotationally elastic diffraction peaks are an order of magnitude smaller. All the time-of-flight distributions reveal intense peaks at ΔE=−11.06 meV corresponding to the HD rotational transition ji=0→jf=1. The rotational energy loss observed at angles between the diffraction peaks is attributed to incoherent inelastic scattering at defects. The other inelastic peaks in the time-of-flight spectra can be assigned to phonons which are created or annihilated in the rotationally inelastic collisions. The measured phonon dispersion curves suggest a predominant interaction with the transverse bulk edge and not with the Rayleigh mode. These results provide the first direct evidence for a coupling of rotational transitions to the phonons of a metal surface. The pronounced rotational inelasticity at step edges does not support the widely held view that nonactivated chemisorption occurs at step edges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458105
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Differential basement membrane composition in multiple epithelioid haemangioendotheliomas of liver and lung (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 18 (1991), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report a case of epithelioid haemangioendothelioma involving both lung and liver. The tumour cells were positive for factor-VIII-related antigen. Immunohistochemical analysis of various basement membrane components in tumour tissue of lung and liver showed striking differences. In the liver tumour there was selective expression of collagen IV, with minimal and focal amounts of laminin and basement membrane-associated heparan sulphate proteoglycan. In the lung tumour nodules, in contrast, all these basement membrane components were present. These patterns of basement membrane expression closely resemble those of normal liver and lung basement membrane respectively. We suggest that this provides evidence that epithelioid haemangioendothelioma arises from local endothelial cell proliferation and that it supports the assumption of a multicentric rather than metastatic origin when multiple tumour deposits are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1991.tb00850.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Photon emission from adsorbed C60 molecules with sub-nanometer lateral resolution (1993)
    Springer
    Applied physics 57 (1993), S. 513-516 
    Details
    ISSN: 1432-0630
    Keywords: 61.16.Ch ; 73.40.Gk ; 78.60.Fi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present the first experimental demonstration of spatially resolved photon emission of individual molecules on a surface. A scanning tunneling microscope (STM) was used as a local electron source to excite photon emission from hexagonal arrays of C60 molecules on Au(110) surfaces. Specifically, we show that in maps of photon emission intensities, C60 fullerenes appear as arrays of individual light emitters 4 Å in diameter and separated by 10 Å. Comparison with simultaneously recorded STM images reveals, that most intense emission is detected when the STM tip is centered above a molecule. The results demonstrate the highest spatial resolution of light emission to date using a scanning probe technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331750
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Internal structure of C60 fullerence molecules as revealed by low-temperature STM (1993)
    Springer
    Applied physics 57 (1993), S. 207-210 
    Details
    ISSN: 1432-0630
    Keywords: 36.40+D ; 61.16.-D ; 68.35.Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have performed Scanning Tunneling Microscopy (STM) in ultra-high vacuum at low temperatures (5 and 50K) of unordered and ordered C60 layers adsorbed on a Au(110) surface. STM topographs of the frozen C60 molecules reveal four symmetric patterns within single molecules, which may be associated with different orientations of the fullerenes on a highly corrugated gold substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331447
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A complementary cesium coolant concentration ratio for localizing defective PWR fuel rods during reactor operation (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 152 (1991), S. 47-54 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Rough techniques for pinpointing defective fuel pins during actual reactor operation were developed for nuclear power plants. These techniques are based on various fission product concentration ratios. Here, a new cesium concentration ratio,134Cs/136Cs, was tested in combination with the more usual cesium ratio134Cs/137Cs. This new cesium ratio confirmed the conclusions drawn from the ratio134Cs/137Cs and provided some additional information on the location of the defective fuel rods. Application of this second cesium ratio improves the reliability of the rough localization method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042140
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Photon emission from small particles in an STM (1993)
    Springer
    The European physical journal 26 (1993), S. 87-88 
    Details
    ISSN: 1434-6079
    Keywords: 61.16.Di ; 78.65.Ez ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425626
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    Paper (German National Licenses)
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