ISSN:
1600-5767
Quelle:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Thema:
Geologie und Paläontologie
,
Physik
Notizen:
A coordinate X-ray diffractometer based on a flat two-coordinate multiwire proportional chamber 350 × 350 × 10 mm and information readout from cathode printed-circuit delay lines is described. The diffractometer is used to study macromolecular single crystals. The chamber is placed on a two-circle goniometer at distances of 300, 500 and 750 mm from the crystal. The diffractometer operates on-line with an SM-2 computer. A diffraction picture is collected in a 64 K 16-bit word computer core memory with the maximum count rate of 250000 events s−1. The detection quantum efficiency of Cu Kα radiation is about 70%. The number of spatial resolution elements of a diffraction picture is ̃50000, the resolution time ̃0.5 μs. The general case of inclined geometry is used. The diffraction picture is collected during quasi-continuous scanning. Control of the diffractometer, data collection and pre-computing X,Z are performed at the same time. The diffractometer makes it possible to study single crystals having unit cells up to 250 Å at a resolution of 3.5 Å and to 84 Å at a resolution of 1.5 Å.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1107/S0021889882012801
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