| Issue |
A&A
Volume 662, June 2022
|
|
|---|---|---|
| Article Number | A111 | |
| Number of page(s) | 17 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/202243571 | |
| Published online | 28 June 2022 | |
Rotational spectroscopy of n-propanol: Aa and Ag conformers★
1
I. Physikalisches Institut, Universität zu Köln,
Zülpicher Straße 77,
50937
Köln,
Germany
e-mail: zingsheim@ph1.uni-koeln.de; hspm@ph1.uni-koeln.de
2
Max-Planck-Institut für Radioastronomie,
Auf dem Hügel 69,
53121
Bonn,
Germany
Received:
16
March
2022
Accepted:
5
May
2022
Context. The primary alcohol n-propanol (i.e., normal-propanol or propan-1-ol; C3H7OH) occurs in five different conformers: Ga, Gg, Gg', Aa, and Ag. All rotational spectra of the three conformers of the G family are well described, making astronomical search of their spectroscopic signatures possible, as opposed to those of the Aa and Ag conformers.
Aims. Our goal is to facilitate the astronomical detection of Aa and Ag conformers of n-propanol by characterizing their rotational spectra.
Methods. We recorded the rotational spectra of n-propanol in the frequency domain of 18-505 GHz. Additional double-modulation double-resonance (DM-DR) measurements were performed, more specifically with the goal to unambiguously assign weak transitions of the Aa conformer and to verify assignments of the Ag conformer.
Results. We derived a spectroscopic quantum mechanical model with experimental accuracy (with Jmax = 70 and Ka,max = 6) for Aa n-propanol. Furthermore, we unambiguously assigned transitions (with Jmax = 69 and Ka,max = 9) of Ag n-propanol; in doing so, we prove the existence of two tunneling states, Ag+ and Ag−.
Conclusions. The astronomical search of all five conformers of n-propanol is now possible via their rotational signatures. These are applied in a companion article on the detection of n-propanol toward the hot molecular core Sgr B2(N2).
Key words: molecular data / methods: laboratory: molecular / techniques: spectroscopic / ISM: molecules / radio lines: ISM / submillimeter: ISM
The supplementary material, our predictions of the rotational spectra (*.cat files), are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/662/A111
© O. Zingsheim et al. 2022
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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