ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
Foster & Hargreaves [Acta Cryst. (1963), 16, 1127], in discussing partial mixed moments of structure amplitudes, remark in passing 'For the triclinic, monoclinic and orthorhombic space groups the partial moments mpq are zero when either p or q is odd, but for higher symmetries non-zero moments exist for p odd and q even'; the remark is repeated without comment by Srinivasan & Parthasarathy [Some Statistical Applications in X-ray Crystallography (1976). Oxford: Pergamon Press]. Shmueli & Wilson failed to find any such non-zero moments among the general reflexions for any space group, and the problem has therefore been re-examined. Non-zero odd mixed moments are often found to occur in the plane groups with threefold or sixfold rotors, and hence in the hkO, but not the hkl, reflexions in space groups with trigonal or hexagonal symmetry. Details will be given in a forthcoming paper by Shmueli & Kaldor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739482001818
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