Title :

Millimeter-Wave Spectroscopy of Methoxymethanol

Author(s) :

Motiienko, Roman [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Margulès, L., [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Guillemin, J.-C., [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Despois, D. [Auteur]
FORMATION STELLAIRE 2016

Conference title :

2016isms.confETH04M - 71st International Symposium on Molecular Spectroscopy: June 20-24, 2016 at The University of Illinois at Urbana-Champaign. Talk TH04

City :

Urbana-Champaign

Country :

Etats-Unis d'Amérique

Start date of the conference :

2016-06-20

Publication date :

2016-06

English keyword(s) :

Astronomy

HAL domain(s) :

Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]

English abstract : [en]

Methoxymethanol (CH_3OCH_2OH), a ten atoms molecule, is a very interesting candidate for the detection in the interstellar medium since it can be formed by the reaction between both possible radicals of methanol: CH_3O ...
Show more >Methoxymethanol (CH_3OCH_2OH), a ten atoms molecule, is a very interesting candidate for the detection in the interstellar medium since it can be formed by the reaction between both possible radicals of methanol: CH_3O (already detected in the ISM) and CH_2OH. It could be also formed by addition of CH_3O on formaldehyde (another detected compound in the ISM) followed by the addition or abstraction of a hydrogen radical. According to quantum chemical calculations, methoxymethanol has three stable conformations: Gg, Gg', and Tg. The most stable Gg conformation has a small dipole moment of 0.27 D, whereas two others conformations Gg' and Tg are considerably less stable (8.5 kJ/mol and 10.9 kJ/mol respectively), but have much greater dipole moments (2.47 D and 2.17 D respectively). Thus, in the room-temperature rotational spectra the three conformations may have approximately the same line intensities. We measured the rotational spectrum of methoxymethanol between 150 and 500 GHz and detected all three conformations. The major difficulties in the spectral analysis consist in the very dense spectrum of methoxymethanol and low signal-to-noise ratio of the lines, and in different large amplitude motions. The methyl top internal rotation splittings were observed for the rotational lines of Gg and Gg' conformations. The doublet structure of Tg conformation rotational lines may be explained by -OH group tunneling between two equivalent gauche configurations. The analysis is in progress, the latest results will be presented. The support of the "Action sur Projets de l'INSU PCMI, and ANR-13-BS05-0008-02 IMOLABS" is gratefully acknowledgedShow less >

Language :

Anglais

Peer reviewed article :

Non

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL