THE (SUB-)MILLIMETER-WAVE SPECTRUM OF PROPANAL

Zingsheim, Oliver

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https://hdl.handle.net/2142/96952 Copy

Description

Title

THE (SUB-)MILLIMETER-WAVE SPECTRUM OF PROPANAL

Author(s)

Zingsheim, Oliver

Contributor(s)

• Schlemmer, Stephan
• Lewen, Frank
• Müller, Holger S. P.

Issue Date

6/22/2017

Keyword(s)

Mini-symposium: ALMA's Molecular View

Abstract

The microwave spectrum of propanal, also known as propionaldehyde, CH$_3$CH$_2$CHO, has been investigated in the laboratory already since 1964$^1$ and has also been detected in space$^2$. Recently, propanal was detected with the Atacama Large Millimeter/submillimeter Array (ALMA), Protostellar Interferometric Line Survey (PILS)$^3$. The high sensitivity and resolution of ALMA indicated small discrepancies between observed and predicted rotational spectra of propanal. As higher accuracies are desired the spectrum of propanal was measured up to 500$,$GHz with the Cologne (Sub-)Millimeter spectrometer. Propanal has two stable conformers, textit{syn} and textit{gauche}, which differ mainly in the rotation of the aldehyd group with respect to the rigid C-atom framework of the molecule. We extensively studied both of them. The lower textit{syn}-conformer shows small splittings caused by the internal rotation of the methyl group, whereas the spectrum of textit{gauche}-propanal is complicated due to the tunneling rotation interaction from two stable degenerate conformers. Additionally, we analyzed vibrationally excited states._x000d_ _x000d_ $^1$ Butcher et al., textit{J. Chem. Phys.} textbf{40} 6 (1964)_x000d_ _x000d_ $^2$ Hollis et al., textit{Astrophys. J.} textbf{610} L21 (2004)_x000d_ _x000d_ $^3$ Lykke et al., textit{A&A} textbf{597} A53 (2017)

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/96952

DOI

10.15278/isms.2017.RF07

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