Abstract
Effect of infrared radiation (heat ray) on FT-IR external reflection spectra of Langmuir monolayers (L films) was examined in detail by changing the amount of radiation energy with an inserted optical aperture and a band path filter to cut off the heat ray. If the radiation energy at the level of normal FT-IR measurements was used, the external reflection spectra of the L films of stearic acid at large surface areas could not be observed, owing to the temperature increase in the irradiated region and the enormous surface density decrease which follows it. In this connection, the effect of wind (air flow) on the same measurements was also examined and discussed.
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