  A new method for the analysis of the scattering rates from angle-resolved
photoelectron spectroscopy (ARPES) is presented and described in details. It
takes into account experimental instrumental resolution and finite temperature
effects. More accurate results are obtained in comparison with a standard,
commonly used method. The application of the method is demonstrated for several
examples commonly encountered in new quantum materials. Its usefulness is
especially apparent in investigations of systems with strongly correlated
electrons.
