Development of a micro-FT-IR system for three-dimensional structural studies

Abstract The oblique transmission method is a simple and effective technique of infrared (IR) spectroscopy for obtaining three-dimensional structural information on solid states. In order to apply this technique to tiny specimens, an IR microscope for oblique transmission measurement was developed. A newly designed optical system enabled oblique irradiation of high irradiance from any direction of incidence. A band pass filter was introduced into this spectrometer to improve the spectrum in the region of low irradiance. In the trial measurement using a single crystal of stearic acid, the obtained spectra were well consistent with its crystal structure.