Bilbao Crystallographic Server => Symmetry mode analysis Help

AMPLIMODES for FullProf (and Jana)


Symmetry modes for FullProf
This version of AMPLIMODES produces a block of text to be inserted in the .pcr input file of FullProf to enable a direct refinement of the amplitudes of the basis symmetry-modes generated by AMPLIMODES, instead of performing a conventional refinement of individual atomic coordinates. The program can also generate a default starting .pcr file for simulation of a neutron powder diffraction diagram and for generating with FullProf Studio graphic representations of the different modes. The produced .pcr file can also be read by Jana2006.

In this version for FullProf (and Jana), the input of a low symmetry structure is optional; apart from the high-symmetry structure, only the input of the space group of the distorted structure and its transformation matrix is necessary. If a model for the low symmetry structure is also given, the program will return in the .pcr file the amplitudes of the basis modes corresponding to this starting model, instead of setting them to zero.

Fullprof tutorial: download
Extra data for the tutorial: download

Structure data
HINT: [ Upload the structure as a CIF file (default), or as a text in the window below ]
High Symmetry Structure
For the low symmetry structure, only the space group (and transformation matrix) is necessary; the structure is optional. If given, the program will return the corresponding amplitudes of the modes instead of setting them to zero.
Low Symmetry Structure
HINT: [ Upload the structure as a CIF file (default), or as a text in the window below ]
Maximum Δ [ Maximum distance allowed ]

Transformation matrix from high-symmetry setting to low-symmetry one:

In abc format: for instance: c,a-b,a+b; 0 0 0
Or in matrix form:
a'      
||      
b'      
||      
c'      
||      
           Origin shift
a        a        a                   a
+        +        +       
b        b        b                   b
+        +        +       
c        c        c                   c
If the structures are given in a non-standard setting please check here



[ Bilbao Crystallographic Server Main Menu ]

Bilbao Crystallographic Server
http://www.cryst.ehu.es
Licencia de Creative Commons
For comments, please mail to
cryst\@wm.lc.ehu.es