Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Wehres, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Massen, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Borisov, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schmidt, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lewen, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Graf, U. U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Honingh, C. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Higgins, D. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlemmer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language MOLECULAR-SPECTROSCOPY; ROTATIONAL SPECTRUM; COLOGNE DATABASE; MILLIMETER; TEMPERATURES; COEFFICIENTS; SATELLITE; EARTH Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19546