On the intrinsic hook effect associated with pseudo-Voigt profiles

An intrinsic hook effect was always found to be associated with pseudo-Voigt (p-V) profiles when η was less than 0.328 and the FWHM was small (∼0.02°), where η is the fraction of the Cauchy component and FWHM is the full width at half-maximum. The applicability of the Warren–Averbach (WA) analysis for the case of p-V profiles was thoroughly studied and it was found that a p-V profile with η values ranging from 0 to 1 can be safely subjected to WA analysis, provided that the FWHM of the profile is large enough (2w≃ 0.378°).