CPD-IUCr sponsored SDPD Round Robin 3

[Lachlan Cranswick]

The Commission on Powder Diffraction (CPD) of the International
Union of Crystallography (IUCr) is sponsoring a round robin on
structure determination by powder diffractometry (SDPD). The
purpose is to compare different methods of structure solution
on the identical sets of measurements.

The results will be published in the open literature. This
initiative follows the 1998 and 2002 previous SDPD Round Robin
of which the short conclusions were published in CPD Newsletters
25 & 29.

There is a dozen of different methods that can yield the expected
result (atomic coordinates) from a powder pattern, the most recent
being by charge flipping. Not even speaking of prediction means
which do not need the diffraction data. Informations can be found
within the previous CPD Newsletters including the recent issue N°35.
http://www.iucr-cpd.org/

More details and the data for two samples are available at :
http://sdpd.univ-lemans.fr/SDPDRR3/

Deadline : Wednesday 30 April 2008.

Best wishes !

Armel Le Bail & Lachlan Cranswick
February 1st, 2008