A new bugfix and feature version of Chekcell is available on the web. This is a graphical powder indexing helper tool and part of the LMGP suite by Jean Laugier and Bernard Bochu The major fix is problems when doing a "Best Solution" involving Rhombohedral/ Hexagonal trial cells (some array errors have also been fixed). A major speed improvement in performing a "Best Solution" has also be added. For suggesting a "Best Solution", Chekcell uses the ratio of Observed to Calculated HKLs for the various trial cell/spacegroup combinations. This means it can suggest a "hidden low Figure of Merit (FOM)" true solution even if swamped by higher FOM trial cells. There is a tutorial showing Chekcell in action on just this type of problem at: http://www.ccp14.ac.uk/tutorial/lmgp/chekcell_large_hex.htm "Using Chekcell as a Guide to suggest the True Cell on a large lower FOM Hexagonal/Rhombohedral Cell" - Chekcell Download: UK: http://www.ccp14.ac.uk/ccp/web-mirrors/lmgp-laugier-bochu/ CA: http://ccp14.sims.nrc.ca/ccp/web-mirrors/lmgp-laugier-bochu/ AU: ftp://ftp.minerals.csiro.au/pub/xtallography/ccp14/ccp/web-mirrors/lmgp-laugier-bochu/ Other Chekcell Powder Indexing Helper Tool Tutorials via: http://www.ccp14.ac.uk/tutorial/lmgp/ Crysfire Powder Indexing Suite Tutorials and download: http://www.ccp14.ac.uk/tutorial/crys/ Crysfire Download: UK: http://www.ccp14.ac.uk/ccp/web-mirrors/crys-r-shirley/ CA: http://ccp14.sims.nrc.ca/ccp/web-mirrors/crys-r-shirley/ AU: ftp://ftp.minerals.csiro.au/pub/xtallography/ccp14/ccp/web-mirrors/crys-r-shirley/ -- Lachlan M. D. Cranswick Collaborative Computational Project No 14 (CCP14) for Single Crystal and Powder Diffraction Daresbury Laboratory, Warrington, WA4 4AD U.K Tel: +44-1925-603703 Fax: +44-1925-603124 E-mail: [EMAIL PROTECTED] Ext: 3703 Room C14 http://www.ccp14.ac.uk
