Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
Powder Diffraction - Spallation Neutron Source
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Voigt vs. Pseudo-Voigt<br />
A Gaussian convoluted with a Lorentzian function is a Voigt function,<br />
however the Voigt is slow to compute and the derivatives are messy.<br />
Few Rietveld programs implement a Voigt.<br />
The “pseudo-Voigt” is the weighted sum of a Gaussian & Lorentzian<br />
function – approximation is normally pretty good<br />
Fractions of each function depend on the relative widths of each [see mixing<br />
factor () in GSAS manual, =0 is Gaussian, =1 is Lorentzian]<br />
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