Abstract
In some recent papers [Giacovazzo, Burla & Cascarano (1992). Acta Cryst. A48, 901–906; Burla, Cascarano & Giacovazzo (1992). Acta Cryst. A48, 906–912; Cascarano, Giacovazzo, Moliterni & Polidori (1994). Acta Cryst. A50, 22–27], the method of the joint probability distribution of structure factors has been used to define a function that is frequently a maximum for the correct structure. Such a function was the basis for a modified tangent formula using P10 (negative and positive) triplet estimates and negative quartet estimates, which proved more efficient than the classical tangent formula of Karle & Hauptman [Acta Cryst. (1956), 9, 635–651]. The method is here combined with a recent formulation [Giacovazzo (1993). Z. Kristallogr. 206, 161–171], which suggests the supplementary active use in the phasing process of psi-zero triplets. Experimental tests prove the higher efficiency of the method and justify the default active use of psi-zero relationships in SIR92.
Keywords
Joint probability distributionZero (linguistics)Set (abstract data type)Joint (building)MathematicsProbability distributionDiffractionDistribution (mathematics)CombinatoricsPhysicsComputer scienceStatisticsMathematical analysisOpticsEngineeringStructural engineering
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Publication Info
- Year
- 1995
- Type
- article
- Volume
- 51
- Issue
- 6
- Pages
- 820-825
- Citations
- 10
- Access
- Closed
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Cite This
G. Cascarano,
Carmelo Giacovazzo
(1995).
The joint probability distribution of any set of phases given any set of diffraction magnitudes. IV. The active use of psi-zero triplets.
Acta Crystallographica Section A Foundations of Crystallography
, 51
(6)
, 820-825.
https://doi.org/10.1107/s0108767395003734
Identifiers
- DOI
- 10.1107/s0108767395003734