| Feature | Simple Pseudo-Voigt | TCH Pseudo-Voigt | | :--- | :--- | :--- | | $\eta$ refinement | Free parameter, unphysical correlations | Calculated analytically from $H_L/H_G$ | | Physical basis | Empirical | Approximates true Voigt convolution | | Behavior at extremes | Manual constraints needed | Handles pure G/L automatically | | Correlation with FWHM | Severe | Minimal | | Caglioti compatibility | Indirect | Direct |
It allows for rapid refinement of complex patterns with hundreds of overlapping peaks. thompson-cox-hastings pseudo-voigt function