Simultaneous Height Adjust fitting: An alternative automated fitting procedure for laser-induced plasma spectra composed by multiple Lorentzian profiles

Lorentzian signals are valuable information carriers on many science fields. Although well established procedures for nonlinear fitting exists, they tend to show slow performance when either a large number of bands or high resolution signals are involved. This work introduces a procedure that automatically makes an initial estimate of the band's parameters, which are subsequently improved by a routine called Simultaneous Height Adjust (SHA), designed for accounting neighbors' signal distortions, and a linear least square fitting procedure. As result, we obtain an easy to implement and fast procedure that, for the case of LIBS applications, never overestimates the peak's energy. - Highlights: • A fitting algorithm for signals composed by multiple Lorentzian shapes is proposed. • The execution time is linear when a high number of bands and/or points are employed. • Never overestimates peaks' energy. • Does not require user intervention