Solving the crystal structures of zeolites using electron diffraction data. I. The use of potential-density histograms; II. Density-building functions

Acta Cryst. (2008). A64, 284-294 [doi:10.1107/S010876730705862X]
Acta Cryst. (2008). A64, 295-302 [doi:10.1107/S0108767307058631]

Solving crystal structures using electrons instead of X-rays is very difficult: the data are subject to numerous systematic errors. However, electrons can work with samples as small as 50 nm, and give answers when all other methods fail. We use density histograms (just like those in photo manipulation software) and density building along with entropy methods to solve the structures of zeolites in a routine way. The figure shows a map for mordenite; the crosses are the positions of the Si atoms.