A (2-TYPE SURFACE DIFFRACTOMETER - MERGENCE OF THE Z-AXIS AND (2+2)-TYPE GEOMETRIES(3))

Authors
Citation
E. Vlieg, A (2-TYPE SURFACE DIFFRACTOMETER - MERGENCE OF THE Z-AXIS AND (2+2)-TYPE GEOMETRIES(3)), Journal of applied crystallography, 31, 1998, pp. 198-203
Citations number
11
Categorie Soggetti
Crystallography
ISSN journal
00218898
Volume
31
Year of publication
1998
Part
2
Pages
198 - 203
Database
ISI
SICI code
0021-8898(1998)31:<198:A(SD-M>2.0.ZU;2-O
Abstract
It is shown that the addition of an azimuthal detector rotation to a ( 2 + 2)-type diffractometer makes it fully equivalent to a z-axis type. Using this equivalence, the geometric correction factors for this (2 + 3)-type diffractometer, which are needed to obtain structure factors from measured integrated intensities, are derived. The (2 + 3)-circle diffractometer combines the ideal resolution behaviour of a z-axis di ffractometer with the mechanical simplicity and range of a (2 + 2)-cir cle diffractometer. For sample alignment, two additional degrees of fr eedom are needed, leading to a total of seven circles.