| Infrared reflection absorption spectroscopy (IRRAS) is a useful technique for studying thin films on reflective substrates. Molecular orientations of a thin film on a metallic substrate can be determined based on the selective absorption of s- and p-polarized light by the adsorbed molecules when the incident angle is in the grazing angle range.
Polarization modulation (PM) is highly recommended for IRRAS measurement in order to increase the sensitivity of the measurement. In a typical PM-IRRAS experiment, two modulations are applied simultaneously: the Fourier modulation produced by the FT-IR interferometer and the polarization modulation by the photoelastic modulator. Thus, the raw detector signal contains contributions from both modulations when proper electronic flittering is used. Infrared reflection absorption spectroscopy (IRRAS) is a useful technique for studying thin films on reflective substrates. |
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