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Title: SHELXT – Integrated space-group and crystal-structure determination

SHELXT automates routine small-molecule structure determination starting from single-crystal reflection data, the Laue group and a reasonable guess as to which elements might be present. The new computer program SHELXT employs a novel dual-space algorithm to solve the phase problem for single-crystal reflection data expanded to the space group P1. Missing data are taken into account and the resolution extended if necessary. All space groups in the specified Laue group are tested to find which are consistent with the P1 phases. After applying the resulting origin shifts and space-group symmetry, the solutions are subject to further dual-space recycling followed by a peak search and summation of the electron density around each peak. Elements are assigned to give the best fit to the integrated peak densities and if necessary additional elements are considered. An isotropic refinement is followed for non-centrosymmetric space groups by the calculation of a Flack parameter and, if appropriate, inversion of the structure. The structure is assembled to maximize its connectivity and centred optimally in the unit cell. SHELXT has already solved many thousand structures with a high success rate, and is optimized for multiprocessor computers. It is, however, unsuitable for severely disordered and twinned structures because itmore » is based on the assumption that the structure consists of atoms.« less
Authors:
 [1]
  1. Georg-August Universität Göttingen, Tammannstrasse 4, Göttingen, 37077 (Germany)
Publication Date:
OSTI Identifier:
22351158
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta crystallographica. Section A, Foundations and advances (Online); Journal Volume: 71; Journal Issue: Pt 1; Other Information: PMCID: PMC4283466; PMID: 25537383; PUBLISHER-ID: sc5086; OAI: oai:pubmedcentral.nih.gov:4283466; Copyright (c) George M. Sheldrick 2015; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United Kingdom
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALGORITHMS; ATOMS; COMPUTER CODES; CRYSTAL STRUCTURE; DENSITY; ELECTRON DENSITY; MOLECULES; MONOCRYSTALS; ORIGIN; RECYCLING; REFLECTION; RESOLUTION; SPACE GROUPS; SYMMETRY