Comparison of FT-IR Transmission, Specular Reflectance, and Attenuated Total Reflectance Spectra of Polymers

  • R. T. Graf
  • J. L. Koenig
  • H. Ishida
Part of the Polymer Science and Technology book series (POLS, volume 36)


Thin films of poly(methyl methacrylate) were deposited on germanium substrates and analyzed by Fourier transform infrared spectroscopy. Three types of experiments were performed: transmission, specular reflectance, and attenuated total reflectance. The spectra obtained from these experiments differed in the position, shape, and intensity of the bands even though all the experiments were performed on the same sample. These differences were the result of optical distortion effects. To account for these effects the optical constants of the polymer were determined and the expected band profiles for each experiment were calculated. The calculated and experimental spectra agreed well in both position and intensity of the bands.


Optical Constant Absorption Index Attenuate Total Reflectance Reflectance Spectroscopy Specular Reflectance 
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Copyright information

© Plenum Press, New York 1987

Authors and Affiliations

  • R. T. Graf
    • 1
  • J. L. Koenig
    • 1
  • H. Ishida
    • 1
  1. 1.Department of Macromolecular ScienceCase Western Reserve UniversityClevelandUSA

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