21 April 1986 The Cologne Millimeter And Submillimeter-Wave Laboratory Spectrometer
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Proceedings Volume 0598, Instrumentation for Submillimeter Spectroscopy; (1986) https://doi.org/10.1117/12.952336
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France
Abstract
In this report the essential design goals of our millimeter and submillimeter-wave laboratory spectrometer are described. The source-modulation spectrometer is mainly used to provide rest frequencies of rotational transitions of astrophysically interesting molecules in the frequency range 68 - 520 GHz. As phase-locked radiation sources millimeter-wave reflex klystrons and tunable Gunn oscillators are employed. The absorption signals are detected with a newly constructed digital lock-in amplifier. The smallest peak-absorption coefficient that could be observed is 8.10-8 cm-1 at 150 GHz and 2.10-7 cm-1 at 225 GHz in a 400-cm free-space cell. For high-resolution spectroscopy saturation techniques have been applied to resolve overlapping line profiles. The spectrometer is also used for testing new waveguide and quasioptical components and complete subsystems for the Cologne 3-m radio telescope, now located at Gornergrat near Zermatt in the Swiss Alps.
© (1986) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Manfred Bester, Gunter Schwahn, Bernd Vowinkel, Rudolf Schieder, Gisbert Winnewisser, "The Cologne Millimeter And Submillimeter-Wave Laboratory Spectrometer", Proc. SPIE 0598, Instrumentation for Submillimeter Spectroscopy, (21 April 1986); doi: 10.1117/12.952336; https://doi.org/10.1117/12.952336
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