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100 GHz Room-Temperature Laboratory Emission Spectrometer

Published online by Cambridge University Press:  04 September 2018

Nadine Wehres ,
Bettina Heyne ,
Frank Lewen ,
Marius Hermanns ,
Bernhard Schmidt ,
Christian Endres ,
Urs U. Graf ,
Daniel R. Higgins  and
Stephan Schlemmer
Nadine Wehres
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Bettina Heyne
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Frank Lewen
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Marius Hermanns
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Bernhard Schmidt
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Christian Endres
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Urs U. Graf
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Daniel R. Higgins
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
Stephan Schlemmer
Affiliation:
I. Physics Institute, University of Cologne, Zülpicher Str. 77, 50937 Cologne, Germany email: wehres@ph1.uni-koeln.de; schlemmer@ph1.uni-koeln.de
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Abstract

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We present first results of a new heterodyne spectrometer dedicated to high-resolution spectroscopy of molecules of astrophysical importance. The spectrometer, based on a room-temperature heterodyne receiver, is sensitive to frequencies between 75 and 110 GHz with an instantaneous bandwidth of currently 2.5 GHz in a single sideband. The system performance, in particular the sensitivity and stability, is evaluated. Proof of concept of this spectrometer is demonstrated by recording the emission spectrum of methyl cyanide, CH3CN. Compared to state-of-the-art radio telescope receivers the instrument is less sensitive by about one order of magnitude. Nevertheless, the capability for absolute intensity measurements can be exploited in various experiments, in particular for the interpretation of the ever richer spectra in the ALMA era. The ease of operation at room-temperature allows for long time integration, the fast response time for integration in chirped pulse instruments or for recording time dependent signals. Future prospects as well as limitations of the receiver for the spectroscopy of complex organic molecules (COMs) are discussed.

Keywords

astrochemistrymolecular datamethods: laboratorytechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S332: Astrochemistry VII: Through the Cosmos from Galaxies to Planets , March 2017 , pp. 332 - 345
Copyright
Copyright © International Astronomical Union 2018 

Footnotes

†

Present address: Max-Planck Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748 Garching, Germany

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