Figure 6.

Calculated PTIR signal intensity (a) and band position shift (b) for a 1 nm thick, weakly absorbing layer (a = 10⁻³μm, n = 1.4) within a non-absorbing matrix (n = 1.4) as a function of the layer distance from the prism-matrix interface. Calculations were carried out for matrix thicknesses ranging from 100 nm to 1000 nm and for s and p polarization. Band positions were calculated considering the band maximum of a Lorentzian band 10 cm⁻¹ wide centered around 1650 cm⁻¹.