High Resolution Fourier Transform Spectroscopy In The Far Infrared

Dieter Hausamann

doi:10.1117/12.969602

1 December 1989 High Resolution Fourier Transform Spectroscopy In The Far Infrared

Dieter Hausamann

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Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969602
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States

Abstract

The resolution of Fourier transform spectrometers has been considerably improved within the last years, optical path differences of 6 m and above being now commercially available. The Far Infrared Group of the German Aerospace Research Est. is involved in research activities concerning trace gas analysis in the upper atmosphere. Starting point of our investigations is the laboratory spectroscopy of environmentally relevant trace gases, e.g. fluorocarbons, with a high resolution Fourier transform spectrometer. First results for the pure rotational spectrum of CHF3 (Fluoroform) will be presented. The high instrument resolution (ca. 0.0012 cm -1 the FIR) allows very precise determination of molecular constants. Nevertheless, there are some severe problems related to the increasing resolution of FT instruments, especially in the Far Infrared. Phase errors, line asymmetries and other deviations from the ideal case make it very difficult to determine the exact line position as well as to calibrate the intensity scale: absolute line intensities, however, are an essential information for the spectroscopist as well as for the environment analyst who wants to know absolute concentration and detectability limits for pollutants.

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Dieter Hausamann "High Resolution Fourier Transform Spectroscopy In The Far Infrared", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); https://doi.org/10.1117/12.969602

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