A bit of googling came up with lots of useful stuff, including * Wikipedia, unsurprisingly: http://en.wikipedia.org/wiki/Space_group * Table six on http://cci.lbl.gov/sginfo/hall_symbols.html This file: http://cars9.uchicago.edu/svn/horae/trunk/lib/Xray/space_groups.db.PL is where every space group symbol recognized by my software is written down. If your library has a copy of the first volume of the International Tables of Crystallography, that's the ultimate authority. B On Tuesday, September 21, 2010 09:23:26 am Abhijeet Gaur wrote:

Hi all, I am trying to generate the theoretical model of a compound in Artemis. The compound crystallizes in the triclinic space group I1ˉ. As superscript and subscript cannot be given, I tried the notations like I-1, I1-, I1_, but it is showing the message "Invalid space group". I read the tutorial on "Atoms", still not able to resolve the problem. Please help.

With regards Abhijeet Gaur

-- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973 My homepage: http://xafs.org/BruceRavel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/