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  • 1
    Electronic Resource
    Electronic Resource
    Annihilation gamma-ray lineshape parameters (1977)
    Springer
    Applied physics 13 (1977), S. 365-369 
    Details
    ISSN: 1432-0630
    Keywords: 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The S-parameter, introduced by MacKenzie et al., is now widely used to describe annihilation gamma-ray lineshapes recorded with Ge(Li) spectrometers. This paper discusses four descriptive parameters, their statistical properties and their sensitivity to positron trapping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00882612
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Positron trapping and self-diffusion activation energies in chromium (1979)
    Springer
    Applied physics 19 (1979), S. 149-152 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 66.30 F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The activation energy for self-diffusion in chromium is found to be 3.51±0.13 eV from positron trapping measurements. The 4.51 eV activation energy seen in tracer diffusion work is therefore ascribed to divacancies, theQ 2/Q 1 ratio being typical of the bcc refractory group. The positron data give 0.55 for the ratioH 1v M /H 1v F of vacancy migration and formation energies, in agreement with quenching data for tungsten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932389
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Positron trapping in cobalt and trapping threshold temperature correlations (1979)
    Springer
    Applied physics 19 (1979), S. 269-273 
    Details
    ISSN: 1432-0630
    Keywords: 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The monovacancy formation energy of Co is measured as 1.91 eV from a trapping model analysis of theT-dependence of the lineshape parameter. Previously discussed linear relationships between trapping threshold temperature and monovacancy parameters are refined; these relationships can now be regarded as well-established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900470
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Temperature dependence of positron annihilation in iron and vanadium (1978)
    Springer
    Applied physics 16 (1978), S. 29-34 
    Details
    ISSN: 1432-0630
    Keywords: 78.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The Doppler broadened lineshape is measured as a function of temperature for iron and vanadium; vacancies produce a strong trapping effect in γ-Fe, but a weak effect in V. Threshold temperaturesT t for trapping are 1280±25 and 1370±30 K. Empirical linear relationships betweenT t , self-diffusion energyQ SD and monovacancy formation energyH 1v F are discussed and used to determineH 1v F values for γ-Fe and V.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931417
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    Paper (German National Licenses)
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