Open AccessUnit‐cell determination from randomly oriented electron‐diffraction patterns
Author(s) -
Jiang Linhua,
Georgieva Dilyana,
Zandbergen Henny W.,
Abrahams Jan Pieter
Publication year - 2009
Publication title -
acta crystallographica section d
Language(s) - English
Resource type - Journals
ISSN - 1399-0047
DOI - 10.1107/s0907444909003163
Subject(s) - orthorhombic crystal system , unit (ring theory) , diffraction , electron diffraction , electron backscatter diffraction , crystallography , crystal structure , reflection high energy electron diffraction , electron , nanocrystal , materials science , symmetry (geometry) , chemistry , nanotechnology , physics , mathematics , optics , geometry , quantum mechanics , mathematics education
Unit‐cell determination is the first step towards the structure solution of an unknown crystal form. Standard procedures for unit‐cell determination cannot cope with data collections that consist of single diffraction patterns of multiple crystals, each with an unknown orientation. However, for beam‐sensitive nanocrystals these are often the only data that can be obtained. An algorithm for unit‐cell determination that uses randomly oriented electron‐diffraction patterns with unknown angular relationships is presented here. The algorithm determined the unit cells of mineral, pharmaceutical and protein nanocrystals in orthorhombic high‐ and low‐symmetry space groups, allowing (well oriented) patterns to be indexed.