Open AccessON THE USE OF THE SIM WEIGHT IN FOURIER SYNTHESIS
Author(s) -
Cun-Heng He,
Gu Yuan-Xin
Publication year - 1982
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.31.1057
Subject(s) - fourier transform , fourier analysis , discrete time fourier transform , fourier series , phase correlation , physics , mathematics , mathematical analysis , fractional fourier transform
When MULTAN-78 or MULTAN-80 is empoyed to solve a crystal structure, usually only partial structure can be found at first. The remaining atoms are then located by the weighted Fourier synthesis. In this paper, however, two examples are given to show that, when most of the atomic positions are already known, especially when the known part contains heavy atoms, the unweighted Fourier synthesis can give better results than that from the weighted Fourier synthesis.MULTAN-80 has been modified to calculate also the unweighted Fourier synthesis.