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Structural Research / Strukturforschung (English, French, German, Paperback, 1957 ed.)
Dr. Andre Guinier, Dr. Gerard Von Eller, Dr. J. Bouman, Dr. Gerard Fournet, Professor Dr. W. W. Beeman, …
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R3,102
Discovery Miles 31 020
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107 In this way the absolute values of the structure factors may be
found, not the phases (6. 8). The problem to find these phases is
the phase problem. The present article will treat the following
topics. At first the description of the ideal crystal will be given
in Chap. B. The underlying principles of this description are the
concepts of reciprocal lattice, FOURIER synthesis and sym metry.
The evaluation of the intensity will then follow in Chap. C and D.
Chap. E is concerned with the phase problem and related topics.
Though this article treats the analysis of crystal structures, the
fundamental concepts for other structures will here be found too.
But these topics, and the experimental methods, will l find their
place elsewhere . B. Description of the crystalline state. I.
Lattice theory. a) The direct lattice. 8. Introduction. In Sect. 3,
a description of the ideal crystal was given: The space, occupied
by a crystal, is divided into congruent parallelepipeds, each with
the same orientation. This parallelepiped is defined by the three
basic vectors, a, band c, drawn from an origin 0 (Fig. 2), and is
called the primitive cell. This cell is filled with atoms (or
ions), and the same configuration of atoms is repeated in space. It
has been aptly called a three-dimensional wallpaper, as on a
wallpaper the same pattern is repeated again and again.
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