Wehres, N., Massen, J., Borisov, K., Schmidt, B., Lewen, F., Graf, U. U., Honingh, C. E., Higgins, D. R. and Schlemmer, S. (2018). A laboratory heterodyne emission spectrometer at submillimeter wavelengths. Phys. Chem. Chem. Phys., 20 (8). S. 5530 - 5545. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

We present first results on a newly built broadband emission spectrometer for the laboratory making use of a double sideband (DSB) heterodyne receiver. The new spectrometer is perfectly suited for highresolution emission spectroscopy of molecules of astrophysical importance. The current SIS receiver operates at RF frequencies between 270 and 390 GHz, coincident with Band 7 of the ALMA telescope. The instantaneous bandwidth is 5 GHz (DSB). In this work the full spectrometer and its components are described. Its performance, in particular its sensitivity, stability, reproducibility and systematic errors, is characterized in detail. For this purpose very broad band emission spectra of methyl cyanide have been recorded and compared to theoretical spectra. Isotopic variants are found in natural abundance and features attributed to vibrationally excited species are all recorded in the same spectrum. The performance of the new spectrometer is compared extensively to that of a traditional FM-absorption spectrometer and to recent versions of chirped-pulse spectrometers operated in the mm-wave regime. Further applications and future advancements of the current instrument are discussed.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Wehres, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Massen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borisov, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmidt, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lewen, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Graf, U. U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Honingh, C. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Higgins, D. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-195460
DOI: 10.1039/c7cp06394f
Journal or Publication Title: Phys. Chem. Chem. Phys.
Volume: 20
Number: 8
Page Range: S. 5530 - 5545
Date: 2018
Publisher: ROYAL SOC CHEMISTRY
Place of Publication: CAMBRIDGE
ISSN: 1463-9084
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MOLECULAR-SPECTROSCOPY; ROTATIONAL SPECTRUM; COLOGNE DATABASE; MILLIMETER; TEMPERATURES; COEFFICIENTS; SATELLITE; EARTHMultiple languages
Chemistry, Physical; Physics, Atomic, Molecular & ChemicalMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/19546

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