ATR correction

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.

 

An ATR correction is performed as follows:

ATR correction menu command

To perform an ATR correction using the menu command, please follow the instructions below:

1. Activate the spectrum, you like to correct.

2. From the Mathematics menu, select the ATR Correction command.

3. Enter a reference wave number into the Reference Wave Number field.

4. Press the Calculate button.

ATR correction keyboard shortcut

None.

 Advanced ATR correction menu command

To perform an advanced ATR correction using the menu command, please follow the instructions below:

1. Activate the spectrum you'd like to correct.

2. Choose Advanced ATR Correction from the Mathematics menu.

3. Enter the refractive indexes of the sample and the crystal.

4. Enter the incident angle of the measurement.

5. 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.

6. Press the Calculate button.

 Advanced ATR correction keyboard shortcuts

None.