Separation of the overlapping spectral lines using derivative spectra

A code package is written to determine the maximum positions and half-widths of overlapping spectral lines forming the total profile. This package allows us to reconstruct spectral line profiles forming the total shape based on the experimental spectrum. An analysis is carried out based on the n-th derivatives of the line shape under study. The package calculates the Doppler, Lorentz and Voigt profiles and their n-th order derivatives and constructs spectral line profiles forming the spectral line under consideration and the corresponding total profile. These codes can be used both in molecular and in atomic spectroscopy, if need be.