Determination of line strengths by Fourier-transform spectroscopy

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Abstract
A rigorous test of the photometric accuracy of commercial high-resolution Fourier transform spectrometers has been made by measuring line strengths in the pure rotational spectrum of carbon monoxide. Measurements have been made with a Bruker IFS 120 HR spectrometer (transitions: J″ = 7 … 23) and a Bomen DA3.002 spectrometer (J″ = 27 … 35). A least-squares fit of individual data sets and the combined data gave permanent electric dipole moments in the range 0.1091–0.1101 D and quadratic Herman–Wallis factors in the range −0.188 to −0.229 × 10−3, in good agreement with literature values within the overall uncertainty. Sources of systematic errors in the Fourier-transform spectrometer and in the algorithms used to reduce the data are discussed in detail. The experimental results show that such errors affected the retrieved line strengths by less than 1%.

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