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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 46,
  • Issue 1,
  • pp. 156-158
  • (1992)

Polarization-Modulation Emission FT-IR Measurement of Thin Organic Films on Metal Surfaces

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Abstract

A polarization-modulation technique has been combined with Fourier transform infrared (FT-IR) spectrometry to eliminate the large background radiation which interferes with the infrared emission from thin organic films on metal surfaces. A step scan and a continuous scan interferometer which were combined with a photoelastic modulator were also studied, and the step scan system was found to be stabler and have a better S/N. The spectrum of a 12-nm perfluoropolyether film was obtained at 120°C by this system.

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