Effect in ATR Spectra

As opposite to IRRAS, the band intensity in ATR spectra is positive, independent of the optical properties of the substrate and orientation of the dipole moment of the 

A comparison between band intensities obtained with the exact formulas and those obtained by the thin-film approximation (Fig. 3.21c, d) reveals that the highest deviation from linearity is observed for the modes polarized in the film plane. 

Spectrum distortions in the in situ ATR spectra measured in Otto s configuration with a nonmetalic substrate are discussed in Ref. [61b]. 

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