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 Results for DC.creator="R." AND DC.creator="Chandrasekaran" in section 19.5.3 of volume F
Diffracted intensities: polycrystalline fibres
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.6, pp. 584-585 [ doi:10.1107/97809553602060000871 ]
... lateral organization of the polymers, intensities are observed at discrete R values defined by the reciprocal-lattice points. In the case ... upon the unit-cell dimensions, other reflections having the same R value may also be superposed to give a single intensity, and those having R values close to each other may be difficult to ...

Diffracted intensities: noncrystalline fibres
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.5, p. 584 [ doi:10.1107/97809553602060000871 ]
... Klug, 1955): The intensity varies continuously as a function of R along each layer line (Fig. 19.5.2.1a). References Franklin, R. E. & Klug, A. (1955). The splitting of layer lines ...

Fourier-Bessel syntheses
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.4, p. 584 [ doi:10.1107/97809553602060000871 ]
Fourier-Bessel syntheses 19.5.3.4. Fourier-Bessel syntheses Electron densities may be calculated for crystalline fibres, as they are in crystallography, using Fourier syntheses with coefficients determined for the crystalline reflections. For noncrystalline fibres, it is more convenient to use Fourier-Bessel syntheses: the electron density [rho] at point is where References ...

Diffraction by helical molecules
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3, pp. 584-585 [ doi:10.1107/97809553602060000871 ]
... to describe helical molecules. In real space we use coordinates (r, [varphi], z); in reciprocal space (R, [psi], Z). By convention, the z axis is the ... coordinates of a point in the first repeating unit are (r, [varphi], z), then applying the helical symmetry gives the ...

Helical symmetry
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.2, p. 584 [ doi:10.1107/97809553602060000871 ]
... to describe helical molecules. In real space we use coordinates (r, [varphi], z); in reciprocal space (R, [psi], Z). By convention, the z axis is the ... coordinates of a point in the first repeating unit are (r, [varphi], z), then applying the helical symmetry gives the ...

Fibre diffraction patterns
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.1, p. 584 [ doi:10.1107/97809553602060000871 ]
Fibre diffraction patterns 19.5.3.1. Fibre diffraction patterns As noted above, the diffraction pattern from a fibre is confined to layer lines because of the repeating nature of the polymer helix. The layer lines in reciprocal space are perpendicular to the fibre axis in real space. The layer line passing through the ...

Structure factors
Chandrasekaran, R. and Stubbs, G.  International Tables for Crystallography (2012). Vol. F, Section 19.5.3.3, p. 584 [ doi:10.1107/97809553602060000871 ]
Structure factors 19.5.3.3. Structure factors Cochran et al. (1952) showed that the structure factor on layer line l of a helix made up of repeating subunits isDiffraction occurs only for and are the real-space coordinates of atom j in the repeating unit of the helix; is the atomic scattering factor ...

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