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OASIS : a computer program for breaking phase ambiguity in one‐wavelength anomalous scattering or single isomorphous substitution (replacement) data
Author(s) -
Hao Q.,
Gu Y. X.,
Zheng C. D.,
Fan H. F.
Publication year - 2000
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/s0021889800001424
Subject(s) - anomalous scattering , ambiguity , scattering , wavelength , sign (mathematics) , phase (matter) , substitution (logic) , phase problem , crystallography , physics , optics , computational physics , computer science , mathematics , chemistry , quantum mechanics , mathematical analysis , diffraction , programming language
The phase problem is reduced to a sign problem once the anomalous‐scatterer or the replacing‐heavy‐atom sites are located. OASIS adopts the CCP 4 format [Collaborative Computational Project, Number 4 (1994). Acta Cryst. D 50 , 760–763]. It applies a direct‐method procedure to break the phase ambiguity intrinsic to one‐wavelength anomalous scattering (OAS) or single isomorphous replacement (SIR) data.