You can choose one of a number of peak profile functions to describe the shape of the window's diffraction peaks. CrystalDiffract also lets you change the peak width (full-width at half-maximum, FWHM). Note that these settings are assumed to be instrument properties, and hence they apply to all simulated patterns in the current window.

To change the peak shape Show

Do the following:

  1. Choose a peak function from the Diffraction > Peak Function submenu. Four functions are currently support: Delta Function, Lorentzian, Gaussian and Pseudo-Voigt.

  2. If you are using the Pseudo-Voigt function, you can specify its Eta parameter by choosing Diffraction > Peak Function > Eta and specifying a value in the sheet/dialog that appears.

You can also change the peak shape using the Peak Profile popup in the Instrument group of the Parameters Inspector.

To change peak widths Show

Open the Instrument group in the Parameters Inspector, then do one of the following:

See also

Particle size & strain