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

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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.

Keywords: Fourier transform infrared spectrometer; Infrared emission spectrum; Polarization modulation; Step scan

Document Type: Research Article


Affiliations: Hitachi Research Laboratory, Hitachi Ltd., 4026 Kuji-cho, Hitachi-shi, Ibaraki 319-12, Japan

Publication date: January 1, 1992

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