Calculating Thickness of Free-Standing Film by FTIR
Qualitative and quantitative analysis of polymer materials is frequently done by preparing a relatively thin film of the material for infrared spectroscopy. These prepared sample materials generally have parallel sides and smooth surfaces and typically produce a well known “fringing effect”1, 2, which originates from constructive and destructive interference of the IR beam from these parallel surfaces of the sample. This effect is clearly seen in the FTIR spectrum of a 1.5 mil thickness polystyrene sample shown in Figure 1.
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