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  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The direct observation and utilization of dynamical phase in convergent-beam electron diffraction (1993)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 376-378 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: . It is shown experimentally that significant structural phase information can be obtained by direct interference in the diffraction plane. Specifically, the intensity distributions of the {100} discs in the convergent-beam pattern of α(low)-quartz form, to within experimental accuracy, a hexagonal array about the c axis, but with suitable electron optics these beams can be made to interfere and the regions of overlap then form a trigonal array about the same axis. The relative phases and intensities thus determined are, of course, dynamical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767393000145
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The reduction of N-beam scattering from noncentrosymmetric crystals to two-beam form (1994)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 730-736 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It is shown that certain noncentrosymmetric seven-beam configurations can be reduced to two-beam form. This is exemplified for the space group of a-quartz, namely P3121, with the incident beam along [001]. Explicit eigenvalues and eigenvectors are given for this case and it is shown that the two-beam form is independent of the imaginary parts of the structure amplitudes. The reduction is shown to result from five zero projectors rather than confluence, although confluence is present. An exhaustive list of the 15 reducible noncentrosymmetric space groups is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767394003673
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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