The millimeter-wave spectrum of methyl ...
Type de document :
Compte-rendu et recension critique d'ouvrage
PMID :
Titre :
The millimeter-wave spectrum of methyl ketene and the astronomical search for it
Auteur(s) :
Bermúdez, C. [Auteur correspondant]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Tercero, B., [Auteur]
Observatorio Astronomico Nacional, Madrid
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]
Cernicharo, J., [Auteur]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Ellinger, Y. [Auteur]
Laboratoire de chimie théorique [LCT]
Guillemin, J.-C., [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Tercero, B., [Auteur]
Observatorio Astronomico Nacional, Madrid
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]
Cernicharo, J., [Auteur]
Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC]
Ellinger, Y. [Auteur]
Laboratoire de chimie théorique [LCT]
Guillemin, J.-C., [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Titre de la revue :
Astronomy and Astrophysics - A&A
Pagination :
A92
Éditeur :
EDP Sciences
Date de publication :
2018-11
ISSN :
0004-6361
Mot(s)-clé(s) en anglais :
ISM: molecules
methods: laboratory: molecular
submillimeter: ISM
molecular data
line: identification
methods: laboratory: molecular
submillimeter: ISM
molecular data
line: identification
Discipline(s) HAL :
Physique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
Résumé en anglais : [en]
Context. The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of ...
Lire la suite >Context. The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of new species. Aims. Our goal consists in analyzing one of the two most stable species of the C 3 H 4 O family, methyl ketene, whose actual rotational parameters are not precise enough to allow its detection in the ISM. The obtained parameters will be used to search for it in the high-mass star-forming regions Orion KL and Sagittarius B2, as well as in the cold dark clouds TMC-1 in the Taurus Molecular Cloud and Barnard 1 (B1-b). Methods. A millimeter-wave room-temperature rotational spectrum of methyl ketene was recorded from 50 to 330 GHz. The internal rotation analysis of its ground state and first torsional excited state was performed with the rho-axis method employing the RAM36 program. Results. More than 3000 transitions of the rotational spectrum of the ground state (K a max = 18) and first torsional excited state (K a max = 13) of methyl ketene were fitted using a Hamiltonian that contains 41 parameters with a root mean square of 44 kHz. Column density limits were calculated but no lines were detected in the ISM belonging to methyl ketene.Lire moins >
Lire la suite >Context. The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of new species. Aims. Our goal consists in analyzing one of the two most stable species of the C 3 H 4 O family, methyl ketene, whose actual rotational parameters are not precise enough to allow its detection in the ISM. The obtained parameters will be used to search for it in the high-mass star-forming regions Orion KL and Sagittarius B2, as well as in the cold dark clouds TMC-1 in the Taurus Molecular Cloud and Barnard 1 (B1-b). Methods. A millimeter-wave room-temperature rotational spectrum of methyl ketene was recorded from 50 to 330 GHz. The internal rotation analysis of its ground state and first torsional excited state was performed with the rho-axis method employing the RAM36 program. Results. More than 3000 transitions of the rotational spectrum of the ground state (K a max = 18) and first torsional excited state (K a max = 13) of methyl ketene were fitted using a Hamiltonian that contains 41 parameters with a root mean square of 44 kHz. Column density limits were calculated but no lines were detected in the ISM belonging to methyl ketene.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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