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Iván da Silva, Javier González-Platas, Carmelo Giacovazzo, Angela Altomare
About the variable-counting-time techniques in powder diffraction data: their use in EXPO2004
Keywords: Direct methods, Powder diffraction, Crystal structure analysis, Data collection strategy, Variable-counting-time techniques
High quality data are essential for crystal structure solution, particularly when Direct Methods instead of Global Optimization Techniques are used. In this work we study the performances of the variable-counting-time techniques in the two crucial steps of the phasing process: decomposition of the full diffraction pattern and direct phasing. The experimental data were collected by a conventional X-ray laboratory diffractometer: they were then submitted to the program EXPO2004 for assessing their usefulness in the phasing process. The results are compared with those obtained by using experimental diffraction data collected via the traditional fixed-counting-time technique under the same experimental conditions.
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 222, 12/2007
Pages: 669 - 675