Results for by Helliwell, J. R.
Rotation/oscillation geometry
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3, p.
of reciprocal space can be recorded within a smaller angle. There is a blind region close to the rotation axis; this is detailed in Subsection 2.2.3.5 . 2.2.3.2. Diffraction coordinates | top | pdf | Figs. 2.2.3.1(a) to (d ...

Blind region
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3.5, p.
ray techniques In normal-beam geometry, any relp lying close to the rotation axis will not be stimulated at all. This situation is shown in Fig. 2.2.3.4 . The blind region has a radius of and is therefore strongly ...

Relationship of reciprocal-lattice coordinates to crystal system parameters
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3.3, p.
ray techniques The reciprocal-lattice coordinates, etc . used earlier, refer to an axial system fixed to the crystal, of Fig. 2.2.3.3 . Clearly, a given relp needs to be brought into the Ewald sphere by the rotation ...

Diffraction coordinates
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3.2, p.
ray techniques Figs. 2.2.3.1(a) to (d) are taken from IT II (1959, p. 176). They neatly summarize the geometrical principles of reflection, of a monochromatic beam, in the reciprocal lattice for the general case ...

General
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3.1, p.
the diffraction spots, is 180° + . If the crystal has additional symmetry, then a complete asymmetric unit of reciprocal space can be recorded within a smaller angle. There is a blind region close to the rotation axis; this is detailed in Subsection 2.2.3.5 ...

Maximum oscillation angle without spot overlap
Helliwell, J. R., International Tables for Crystallography (2006). Vol. C, Section 2.2.3.4, p.
as to reduce the background noise in the diffraction images and also to avoid loss of any data because of spot overlap. References Weisgerber, S. & Helliwell, J. R. (1993). High-resolution crystallographic studies of native ...