Complex molecules in the laboratory - A comparison of chriped pulse and emission spectroscopy

Hermanns, Marius

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https://hdl.handle.net/2142/97041 Copy

Description

Title

Complex molecules in the laboratory - A comparison of chriped pulse and emission spectroscopy

Author(s)

Hermanns, Marius

Contributor(s)

• Schlemmer, Stephan
• Maßen, Jakob
• Wehres, Nadine

Issue Date

2017-06-20

Keyword(s)

Instrument/technique demonstration

Abstract

Detecting molecules of astrophysical interest in the interstellar medium strongly relies on precise spectroscopic data from the laboratory. In recent years, the advancement of the chirped-pulse technique has added many more options available to choose from. The Cologne emission spectrometer is an additional path to molecular spectroscopy. It allows to record instantaneously broad band spectra _x000d_ with calibrated intensities._x000d_ Here we present a comparison of both methods: The Cologne chirped-pulse spectrometer as well as the Cologne emission spectrometer both cover the frequency range of 75-110 GHz, consistent with the ALMA Band 3 receivers. High sensitive heterodyne receivers with very low noise temperature amplifiers are used with a typical bandwidth of 2.5 GHz in a single sideband. Additionally the chirped-pulse spectrometer contains a high power amplifier of 200 mW for the excitation of molecules._x000d_ Room temperature spectra of methyl cyanide and comparison of key features, such as measurement time, sensitivity, limitations and commonalities are shown in respect to identification of complex molecules of astrophysical importance. In addition, future developments for both setups will be discussed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/97041

DOI

https://doi.org/10.15278/isms.2017.TH08

Copyright and License Information

Copyright 2017 Marius Hermanns

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