ROTATIONAL SPECTROSCOPY OF 2- AND 4-CYANOBIPHENYL

Schlemmer, Stephan

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https://hdl.handle.net/2142/122383 Copy

Description

Title

ROTATIONAL SPECTROSCOPY OF 2- AND 4-CYANOBIPHENYL

Author(s)

Schlemmer, Stephan

Contributor(s)

• Thorwirth, Sven
• von Rötel, Lise
• Fatima, Mariyam
• Heyne, Bettina

Issue Date

2023-06-21

Keyword(s)

Rotational structure/frequencies

Abstract

The class of polycyclic aromatic hydrocarbons (PAHs) presents an important motif in building the chemical environment of the interstellar medium. Around 10 to 25% of all interstellar carbon is thought to be locked up as PAHs. Recently benzonitrileᵃ as well as 1- and 2- cyanonaphthalene (C₁₀H₇CN), have been identified in radio observations of TMC-1ᵇ based on their laboratory rotational spectra. The detection of these molecules raises possibilities for the presence/formation of other cyano-aromatic molecules in the interstellar medium. In this work, we present chirped-pulse Fourier transform microwave (CP-FTMW) spectra of 2- and 4-cyanobiphenyl (CBP) [C₁₂H₉CN], that are cyano-aromatic molecules. They are measured in the frequency range from 11.5 to 27 GHz. The Cologne CP-FTMW instrument has been designed to achieve high stability and sensitivity, which made it possible to measure the ¹³C isotopologs in natural abundance. In a recent modification to the instrument, we are using state-of-the-art RF modulation and detection technology to directly generate and receive signals in this frequency range, thus abandoning the up- and down-mixing processes of our previous chirped-pulse microwave spectrometer setupᶜ. As a result, the tedious side-band separation is no longer needed. Moreover, the number of elements influencing the intensities is reduced to a minimum. The setup and the results of the CBP measurements will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

eng

Handle URL

https://hdl.handle.net/2142/122383

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