The object of the work reported in this paper was to find a simple and easy to calculate approximation to the Voigt function using the Padé method. To do this we calculated the multipole approximation to the complex function as the error function or as the plasma dispersion function. This generalized Lorentzian approximation can be used instead of the exact function in experiments that do not require great accuracy.
© 1981 Optical Society of America
Pablo Martin and Julio Puerta, "Generalized Lorentzian approximations for the Voigt line shape," Appl. Opt. 20, 259-263 (1981)