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Titolo:
DIRECT-METHODS FOR INCOMMENSURATELY MODULATED STRUCTURES - ON THE APPLICABILITY OF NORMALIZED STRUCTURE FACTORS
Autore:
DEGELDER R; ISRAEL R; LAM EJW; BEURSKENS PT; VANSMAALEN S; FU ZQ; FAN HF;
Indirizzi:
CATHOLIC UNIV NIJMEGEN,MAT RES INST,DEPT INORGAN CHEM,CRYSTALLOG LAB,TOERNOOIVELD 1 NL-6525 ED NIJMEGEN NETHERLANDS CHRISTIAN ALBRECHTS UNIV KIEL,MINERAL PETROG INST & MUSEUM D-24098 KIEL GERMANY CHINESE ACAD SCI,INST PHYS BEIJING 100080 PEOPLES R CHINA
Titolo Testata:
Acta crystallographica. Section A, Foundations of crystallography
, volume: 52, anno: 1996,
parte:, 6
pagine: 947 - 954
SICI:
0108-7673(1996)52:<947:DFIMS->2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
X-RAY-DIFFRACTION; ONE-DIMENSIONAL MODULATION; INTERGROWTH COMPOUNDS; CRYSTALS; SUPERSPACE; INTENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
R. Degelder et al., "DIRECT-METHODS FOR INCOMMENSURATELY MODULATED STRUCTURES - ON THE APPLICABILITY OF NORMALIZED STRUCTURE FACTORS", Acta crystallographica. Section A, Foundations of crystallography, 52, 1996, pp. 947-954

Abstract

The recently defined normalized structure factors for incommensurately modulated structures [Lam, Beurskens & van Smaalen (1993). Acta Cryst. A49, 709-721] have been subjected to extensive tests regarding their applicability in direct methods for phase determination. It is shownthat the probability distribution associated with the structure invariants E(-H)E(H')E(H - H'), where a and H' are reciprocal vectors of main and/or satellite reflections, approximately has the same functionalform as the Cochran distribution but triplet phase relations are relatively less reliable when satellites are involved. The use of the multidimensional Sayre equation for the determination of phases of satellite reflections [Hao, Liu & Fan (1987). Acta Cryst. A43, 820-824; Fu & Fan (1994). J. Appl. Cryst. 27, 124-127] is not improved by using normalized structure factors instead of ordinary structure factors.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 04:00:24