Back-reflection precession camera, a new instrument in reciprocal-lattice photography
Abstract
The precession method is extended to the back-reflection region and used to record distant upper levels. Nets fulfilling the equi-inclination condition ζ = 2 cos [unk] are photographed without a central blind spot. The back-reflection cone-axis technique records nets with ζ [unk] 2 cos [unk]. Due to the mechanical design of the camera, cone-axis patterns are taken by an uninterrupted precession motion; isolated nets are taken by precession oscillations.
The crystal can be rotated about the dial axis and set at will as in frontreflection cameras. In addition, a 90° auxiliary arc permits the dial axis to be tilted by as much as 90° in a plane parallel to the precession axis. Consequently back-reflection photographs of isolated nets and cone-axis photographs can be taken in any direction using a single mounting of the crystal. Also, the instrument is easily converted to operate as a frontreflection precession camera.
Distortions of back-reflection cone-axis rings may be used to orient the crystal. Computer programs are available for (i) correcting misorientations, (ii) calculation of cell parameters and calibration of the camera, and (iii) indexing cone-axis patterns.
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Articles in the same Issue
- Fritz Laves 27.2.1906–12.8.1978
- Similarity and miscibility of inorganic crystals*
- Symmetry of reflexion intensity 10.L. and its connection with the notation of layer sequence of Cdl2 polytypes for a structure analysis application
- The crystal structure of Görgeyite K2SO4 · 5 CaSO4 H2O
- An X-ray diffraction study of barium thiosulphate monohydrate, BaS2O3 · H2O
- Tourmaline as a pyroelectric infra-red radiation detector
- Die Bestimmung der Al/Si-Verteilung mittels Neutronenbeugung in einem Plagioklas An66
- Crystal structure of sapphirine-lTc
- X-ray topographic and ferroelastic studies of 2MC-Sb5O7J single crystals
- Die Kristallstrukturen von Li3Ni20B6 und Li~3Ni16B~8
- Darstellung und Kristallstruktur der ternären Boride SrNi12B6 und BaNi12B6
- The crystal structure of chalcophyllite
- Powder diffraction studies on aluminite and meta-aluminite
- Back-reflection precession camera, a new instrument in reciprocal-lattice photography
- A preliminary report on the structure of ZnMn3O7
- Crystal data for 2-(p-bromophenyl)-trans-5,6pentamethyl-2,3,4,6-tetrahydro-l,3-oxazin-4 on C15H18BrNO2 and 2-(p-bromophenyl)trans-4a,5,6,7,8,8a-hexahydrochinazolin-4(3H) on C14H15BrN2O
- The crystal structure of Ba2Ni9B6
- Redetermination of the structure of anhydrous zinc metaborate Zn4O(BO2)6
