2. Data logging
2.1 Choice of crystal
The first and most important requirement is an excellent single crystal. It doesn't have to have perfect faces, although this is often a quality criterion. The ideal situation would be a sphere, a shape that eliminates the effects of absorption; however, this is not essential, as there are now excellent absorption correction methods that are transparent to the user, even if they are based on an empirical principle, such as the DIFABS calculation program.
It is absolutely essential that the sample is a single crystal, i.e. free from macles, the presence of which can often be detected by microscopic observation, which reveals re-entrant angles. In some cases, crystallization leads only to mottled crystals. To get around this difficulty, we...
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Data logging
Steps in crystal structure determination
Bibliography
- - Il existe un ouvrage général édité par l'Union internationale de cristallographie qui est un recueil de constantes, de formules, de données numériques, qui décrit tous les groupes d'espace et leurs caractéristiques géométriques. Cet ouvrage en quatre volumes est indispensable pour tout cristallographe.
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