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Proceedings Paper

The Cologne Millimeter And Submillimeter-Wave Laboratory Spectrometer
Author(s): Manfred Bester; Gunter Schwahn; Bernd Vowinkel; Rudolf Schieder; Gisbert Winnewisser
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Paper 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.

Paper Details

Date Published: 21 April 1986
PDF: 8 pages
Proc. SPIE 0598, Instrumentation for Submillimeter Spectroscopy, (21 April 1986); doi: 10.1117/12.952336
Show Author Affiliations
Manfred Bester, Universitat zu Koln (FRG)
Gunter Schwahn, Universitat zu Koln (FRG)
Bernd Vowinkel, Universitat zu Koln (FRG)
Rudolf Schieder, Universitat zu Koln (FRG)
Gisbert Winnewisser, Universitat zu Koln (FRG)

Published in SPIE Proceedings Vol. 0598:
Instrumentation for Submillimeter Spectroscopy
Erik L. Kollberg, Editor(s)

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