Far Infrared Absorption Measurements on Thin Polymer Films

Interference fringes in the far infrared spectra of thin films are the result of the coherent adding up of waves and can influence the spectral interpretation by concealing smaller features. A number of methods have been developed in order to eliminate such oscillating features from the transmittance spectrum. The paper critically evaluates the total transmissionreflection technique and applies the method to quantify the spectra of different polymer film