Peak Shape: Thompson-Cox-Hastings pseudo Voigt
The pseudo-Voigt function is an approximation to the Voigt function defined as the convolution of a Lorentzian and a Gaussian:
where and
have different FWHM (
and
,
respectively). The
function is an approximation that substitutes
the two shape parameters
and
by the pair
.
The inversion of the above two expressions leads to the relations:
The FWHM of
the Gaussian and Lorentzian
components is calculated as: