Abstract
A far infrared Fourier spectrometer of modified Michelson type is constructed, with which an optical path difference twelve times as the displacement of the movable mirrors can be realized. The performance of the spectrometer is examined by using water vapour and gaseous methyl alcohol as specimens. The effective spectral range of the spectrometer is 30–90 cm-1, the experimental resolution is 0.11 cm-1 and the accuracy in determining the wave-number is 0.01 cm-1. The coefficients of J and J3 in the expression giving the wave-number of rotational lines in the methyl alcohol spectrum are estimated to be 1.608 cm-1 and 0.75×10-5 cm-1 respectively.
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