Peakfit is much better!

Thank you for your answer Mr. Taran. I will check it.

Best regards,

Leonardo Corecco

Keep in mind that only weak oscillators are approximately Lorentzians. With increasing strength the bands become increasingly asymmetric... https://www.researchgate.net/publication/329225507_Quantitative_Evaluation_of_Infrared_Absorbance_Spectra_-_Lorentz_profile_vs_Lorentz_oscillator

Thank you, Mr. Mayerhöfer. I will check the reference that you sent to me. Do you have a tutorial recommendation that teaches how to calculate the FWHM on Peakfit or on Origin?

Best,

Leonardo Corecco

Actually, my recommendation would be not to use Peakfit or something like that except if you are sure that you have only weak oscillators in your material. In particular when you are dealing with inorganic materials, you should use something like RefFIT (https://reffit.ch/) to determine the damping constant instead (which is identical with FWHM for weak oscillators). It is free of charge and a manual is available.

Thank you, Mr. Mayerhöfer. I will check this

Thank you, Mr. Ardit. I will take a look on that.

Best wishes,

Leonardo Corecco