New version of Chekcell Graphical Powder Indexing Helper Tool for Windows

Lachlan Cranswick l.cranswick at dl.ac.uk
Thu May 18 20:13:36 EST 2000


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: l.cranswick at dl.ac.uk  Ext: 3703  Room C14
                           http://www.ccp14.ac.uk







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