The ATR correction is
only used with IR spectra, that have been recorded with a ATR accessory.
In this case, data points must be corrected for a relative shift introduced
by the instrument configuration.
Perform a base line correction first.
The results of an ATR correction strongly depend on a good base line
of the spectrum. So please perform a baseline
correction first to obtain good results.
Choose Advanced ATR Correction from the Mathematics menu.
Enter the refractive indexes of the sample and the crystal.
Enter the incident angle of the measurement.
Either enter values for the absorption coeffizient and the electric field of the evanescent wave or calculate a machine constant used for further ATR corrections by performing a calculation on a spectrum with a reference. To recalculate the constant, give a new reference spectrum.