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Diffracted beam crystal centering and its application to high‐pressure crystallography
Author(s) -
King H. E.,
Finger L. W.
Publication year - 1979
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889879012723
Subject(s) - diffractometer , diffraction , coordinate system , diamond anvil cell , position (finance) , transformation (genetics) , beam (structure) , crystal (programming language) , optics , crystallography , x ray crystallography , physics , materials science , crystal structure , chemistry , mathematics , geometry , computer science , programming language , biochemistry , finance , economics , gene
Deviations in the position of a crystal from the center of a goniostat and diffractometer alignment errors can be calculated from the observed angles for diffracted radiation. The present study includes a derivation of equations for the general setting ( ω ≠ 0) and a scheme for transformation of these equations into other diffractometer coordinate systems. This method is illustrated by determination of centering errors for FeS in a diamond‐anvil cell. In addition, unit‐cell parameters for this crystal at high pressure are precisely determined with angular data collected by this technique.