Working resolution of 0010 cm^−1 between 20 cm^−1 and 1200 cm^−1 by a Fourier spectrometer

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Abstract
The original double-beam Michelson-type Fourier spectrometer at the University of Oulu has been partly modified so that a maximum resolution of slightly better than 0.010 cm−1 between 20 cm−1 and 1200 cm−1 can be obtained. The resolution is determined as a halfwidth of an observed line. The accuracy of the line position is 0.0005 cm−1 in favorable conditions. The Fourier spectrometer is connected on-line to a minicomputer, in order to make the fast Fourier transforms of interferograms of up to 106 sampling points. The maximum optical path difference of the interferometer is about 1.5 m, giving a maximum theoretical resolution of 0.004 cm−1.