Apologies, part of my previous message was missing and part
appeared twice. Here is another try:
Jacob,
Some small molecule crystallographers have specialized in solving and
refining structures that, exactly as you describe it, consist of two
interpenetrating, non-commensurate lattices. The usual approach is
to index the diffraction pattern in multiple dimensional space
('superspace'). The programs SAINT and EVALCCD are able to integrate
diffraction patterns in up to six dimensions, SADABS is able to scale
them and the refinement is almost always performed with Petricek's
program JANA2000:
http://www-xray.fzu.cz/jana/Jana2000/jana.html
However the case in point is probably commensurate.
George
Prof. George M. Sheldrick FRS
Dept. Structural Chemistry,
University of Goettingen,
Tammannstr. 4,
D37077 Goettingen, Germany
Tel. +49-551-39-3021 or -3068
Fax. +49-551-39-2582
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