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Application of infrared synchrotron radiation to asymmetric Fourier transform spectroscopy at low temperatures

Fourier transform spectroscopy in the asymmetric mode is performed using a two mirror wavefront dividing interferometer. Synchrotron radiation is 100 to 1000 times brighter than black body radiation throughout the infrared region from 1 to 1000 microns. The spatial coherence of synchrotron radiation makes it possible to construct new types of Fourier transform spectrometers in the entire infrared region. Fourier transform spectroscopy in the asymmetric mode may simultaneously yield the optical constants n and k of a material.