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  • 1975-1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Correction factors for neutron diffraction from lamellar structures (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 813-818 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In a spectrometer with finite beam divergence the vertical size of the reflections will increase with the order of reflection. This effect will be more pronounced if the mosaic width of the sample is large, which is often the case with biological samples. When the size of the reflection is greater than the detector size, a correction factor has to be introduced to account for this loss of intensity. A method of calculating this correction factor for a given beam divergence and mosaic width has been developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477001971
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Multilayer neutron monochromators (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 805-813 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Thin-film multilayer monochromators have been fabricated and studied by neutron diffraction. Alternating thin films of two materials, such as Mn and Ge, constitute a one-dimensional crystal owing to the contrast in their scattering amplitude densities. The following are novel features of such a monochromator: (1) large and adjustable d spacing, (2) very high reflectivity, (3) adjustable bandwidth, Δλ/λ. Both kinematical and dynamical theories have been developed to give a proper understanding of the properties of a multilayer. Since a deviation from perfect periodicity can have a substantial effect on diffraction properties of a multilayer, a 'disorder factor' has been introduced in the dynamical theory. Finite resolution of the spectrometer has been taken into consideration when the experimental data are compared with the theoretical expressions. These multilayers can also be used as excellent polarizers and filters for neutrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S056773947700196X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Iron–germanium multilayer neutron polarizing monochromators (1976)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 9 (1976), S. 454-459 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new type of thermal neutron polarizing monochromator, consisting of alternate thin layers of iron and germanium, has been constructed and tested. Bragg reflection from such artificial `crystals' in the fully magnetized state yields a highly polarized beam with high reflecting efficiency (0̃.84) for the reflected spin state. These multilayer monochromators have the additional advantage that higher orders in the reflected beam are almost completely suppressed. Since d spacings are typically large (1̃00 Å), they produce a broader wavelength distribution than conventional single-crystal polarizing monochromators. Nevertheless, there are many applications where wavelength resolution is of secondary importance and the large gain in intensity (4̃0-fold) over conventional polarizing crystals can be a considerable advantage. Multilayers can also be used to advantage in combination with good monochromating crystals such as pyrolytic graphite or beryllium to produce polarized beams of high intensity and good wavelength resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889876011916
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A low-angle neutron data acquisition system for molecular biology (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 455-460 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The BNL low-angle spectrometer was designed and constructed to accommodate a variety of low- and medium-angle experiments in molecular biology. This spectrometer incorporates a 3He two-dimensional position-sensitive counter. Multilayers or conventional crystals are used as monochromators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878013576
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    Paper (German National Licenses)
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