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Figure 4
Generation of the discontinuous helix and its diffraction pattern. (a) A discontinuous helix (i.e. a helical array of subunits) can be thought of as a product of a helical wire, ρh, with a set of horizontal planes, ρk, spaced p apart, where p is the subunit axial translation. (b) The Fourier transform of the discontinuous helix, GDH, is represented as the convolution of the Fourier transforms of objects ρh and ρk, denoted GH and GK, respectively. Graphically, this convolution is represented as a series of overlapping GH patterns, each originating at the meridional reflection positions, separated by 1/p, described by GK (Vainshtein, 1966BB35; Squire, 1981BB28).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 49| Part 3| June 2016| Pages 784-797
doi:10.1107/S1600576716003757
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