W Band Chirped-pulse: The Beauty Of Coherent Spectroscopy

Heyne, Bettina

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https://hdl.handle.net/2142/116538 Copy

Description

Title

W Band Chirped-pulse: The Beauty Of Coherent Spectroscopy

Author(s)

Heyne, Bettina

Contributor(s)

• Schlemmer, Stephan
• Wehres, Nadine
• Hermanns, Marius

Issue Date

2022-06-23

Keyword(s)

Instrument/Technique Demonstration

Abstract

\noindent We built a chirped-pulse Fourier transform millimeter-wave spectrometer (CPFTS) [1], which is operational between 75 and 110 GHz. The design and operation of the instrument (excitation, optical path and detection scheme) will be discussed. The detector is based on a heterodyne receiver of an emission spectrometer [2] which we built and used before to sensitively record rotational spectra of complex molecules. The performance of the CPFTS instrument is analysed by recording spectra of methyl cyanide as well as products from a DC discharge of this molecule. Based on the quantitative calibration of the detector we compare the operation of the instrument as CPFTS with that of the emission spectrometer. We find molecular signals much higher in intensity and much lower in noise for the CPFTS operation. We demonstrate how the detection of the coherent molecular signal (FID) reduces the noise more efficiently compared to the detection of the emitted power when operating the system as an emission spectrometer. \\ \noindent References \\ \noindent [1] M. Hermanns, N. Wehres, B. Heyne, C. E. Honingh, U. U. Graf and S. Schlemmer, in preparation \\ \noindent [2] N. Wehres, B. Heyne, F. Lewen, M. Hermanns, B. Schmidt, C. Endres, U. U. Graf, D. R. Higgins and S. Schlemmer, IAU Symposium, 2018, pp. 332-345

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116538

DOI

https://doi.org/10.15278/isms.2022.RJ06

Copyright and License Information

Copyright 2022 held by the authors

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