# Differences

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 stephens_peakshape [2011/02/11 14:45]johnsoevans stephens_peakshape [2019/07/25 15:13] (current)johnsoevans Both sides previous revision Previous revision 2019/07/25 15:13 johnsoevans 2019/07/25 15:11 johnsoevans 2019/07/25 15:10 johnsoevans 2011/02/11 14:45 johnsoevans 2011/01/20 13:43 johnsoevans 2011/01/20 13:06 johnsoevans 2009/08/28 09:47 clare 2009/08/06 14:54 clare 2009/08/06 14:53 clare 2009/08/06 14:13 clare 2009/08/06 14:13 clare created Next revision Previous revision 2019/07/25 15:13 johnsoevans 2019/07/25 15:11 johnsoevans 2019/07/25 15:10 johnsoevans 2011/02/11 14:45 johnsoevans 2011/01/20 13:43 johnsoevans 2011/01/20 13:06 johnsoevans 2009/08/28 09:47 clare 2009/08/06 14:54 clare 2009/08/06 14:53 clare 2009/08/06 14:13 clare 2009/08/06 14:13 clare created Line 7: Line 7: An alternative approach to spherical harmonics for hkl dependent peak shapes by An alternative approach to spherical harmonics for hkl dependent peak shapes by Peter Stephens (P.W. Stephens, J. Appl. Cryst. (1999) 32, 281-9) as coded in gsas. Peter Stephens (P.W. Stephens, J. Appl. Cryst. (1999) 32, 281-9) as coded in gsas. - eta term allows mixture of Gauss/​Lorentz broadening: + eta term allows mixture of Gauss/​Lorentz broadening. - As an example try the following in your input file (macros you need are below): + Built in macros for different point groups are: + + Stephens_triclinic (-1) + Stephens_monoclinic (2/m) + Stephens_orthorhombic (mmm) + Stephens_tetragonal_low (4/m) + Stephens_tetragonal_high (4/mmm) + Stephens_trigonal_low (-3) + Stephens_trigonal_high (-3m1) + Stephens_trigonal_high_2 (-31m) + Stephens_hexagonal (6/m and 6/mmm) + Stephens_cubic (m-3 and m-3m) + ​ + + Note that for all trigonal Laue classes the macros assume the hexagonal setting of the unit cell + + As an example try the following in your input file (macros you need are below).  Look in topas.inc to double-check the format of macros: ​prm s400 11769.84126` ​prm s400 11769.84126`