SHELXT– Integrated space‐group and crystal‐structure determination

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...

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Published inActa crystallographica. Section A, Foundations and advances Vol. 71; no. 1; pp. 3 - 8
Main Author Sheldrick, George M.
Format Journal Article
LanguageEnglish
Published 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.01.2015
Subjects
ALGORITHMS
ATOMS
COMPUTER CODES
Computer programs
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL STRUCTURE
DENSITY
direct methods
dual‐space recycling
ELECTRON DENSITY
element assignment
Inversions
MOLECULES
MONOCRYSTALS
ORIGIN
Patterson superposition
Phase shift
RECYCLING
REFLECTION
Research Papers
RESOLUTION
Searching
SPACE GROUPS
space‐group determination
SYMMETRY
Unit cell
dual-space recycling
direct methods
Patterson superposition
space-group determination
element assignment
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Summary: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 it is based on the assumption that the structure consists of atoms.
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ISSN:2053-2733
2053-2733
DOI:10.1107/S2053273314026370