TY - JOUR
T1 - Concise intensity statistics of Friedel opposites and classification of the reflections
AU - Shmueli, U.
AU - Flack, H. D.
PY - 2009
Y1 - 2009
N2 - A previous extensive analysis of the mean-square intensity difference of Friedel opposites [Shmueli et al. (2008). Acta Cryst. A64, 476-483] is here concisely re-examined and confirmed by purely statistical methods. The analysis applies to noncentrosymmetric crystals only. For special reflections and centered lattices both mean-square intensity difference and average intensity of Friedel opposites depend on the centering factor of the crystal lattice and/or on the isotropy subgroup of the reflection. A complete classification of the reflections, based on the above intensity statistics, is presented. It is also shown that the experimentally important Bijvoet ratio is found to depend only on the chemical composition of the unit-cell content and the wavelength of the radiation.
AB - A previous extensive analysis of the mean-square intensity difference of Friedel opposites [Shmueli et al. (2008). Acta Cryst. A64, 476-483] is here concisely re-examined and confirmed by purely statistical methods. The analysis applies to noncentrosymmetric crystals only. For special reflections and centered lattices both mean-square intensity difference and average intensity of Friedel opposites depend on the centering factor of the crystal lattice and/or on the isotropy subgroup of the reflection. A complete classification of the reflections, based on the above intensity statistics, is presented. It is also shown that the experimentally important Bijvoet ratio is found to depend only on the chemical composition of the unit-cell content and the wavelength of the radiation.
KW - Bijvoet ratio
KW - Friedel opposites
KW - Noncentrosymmetric crystals
KW - Reflection intensities
UR - http://www.scopus.com/inward/record.url?scp=67650345786&partnerID=8YFLogxK
U2 - 10.1107/S0108767309011040
DO - 10.1107/S0108767309011040
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C2 - 19535854
AN - SCOPUS:67650345786
SN - 0108-7673
VL - 65
SP - 322
EP - 325
JO - Acta Crystallographica Section A: Foundations of Crystallography
JF - Acta Crystallographica Section A: Foundations of Crystallography
IS - 4
ER -