J. Appl. Cryst. (2013). 46, 1219-1220 [ doi:10.1107/S0021889813016233 ]
Abstract: New expressions for the calculation of axial asymmetry peak shape parameter derivatives in the Finger, Cox and Jephcoat model [J. Appl. Cryst. (1994), 27, 892-900] are presented. Code utilizing the new expressions shows an improved range of convergence for powder diffraction peak shape refinements, particularly when the parameters are transformed to A = H + S and B = H - S.
Keywords: asymmetric peak parameters; powder diffraction; data analysis.
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