Submillimeter wave spectroscopy of propanoic acid (CH3CH2COOH) and its ISM search

被引：4

作者：

Ilyushin, V. V. ^{[1
,2
]}

Margules, L. ^{[3
]}

Tercero, B. ^{[4
,5
]}

Motiyenko, R. A. ^{[3
]}

Dorovskaya, O. ^{[1
]}

Alekseev, E. A. ^{[1
,2
]}

Alonso, E. R. ^{[6
]}

Kolesnikova, L. ^{[6
]}

Cernicharo, J. ^{[7
]}

Guillemin, J. C. ^{[8
]}

机构：

[1] NASU, Inst Radio Astron, 4 Mystetstv St, UA-61002 Kharkiv, Ukraine

[2] Kharkov Natl Univ, Quantum Radiophys Dept, Svobody Sq 4, UA-61022 Kharkiv, Ukraine

[3] Univ Lille, PhLAM Phys Lasers Atomes & Mol, CNRS, UMR 8523, F-59000 Lille, France

[4] Observ Astron Nacl OAN IGN, C Alfonso XII 3, Madrid 28014, Spain

[5] Observ Yebes IGN, Cerro Palera S-N, Guadalajara 19141, Spain

[6] Univ Valladolid, Lab Espectroscopia & Bioespectroscopia, Unidad Asociada CSIC, Grp Espectroscopia Mol, Valladolid, Spain

[7] Inst Fis Fundamental IFF CSIC, Grp Astrofis Mol, C Serrano 121, Madrid 28006, Spain

[8] Univ Rennes, Ecole Natl Super Chim Rennes, CNRS, ISCR,UMR6226, F-35000 Rennes, France

来源：

JOURNAL OF MOLECULAR SPECTROSCOPY | 2021年 / 379卷

关键词：

ISM; molecules; Methods; laboratory; molecular; Submillimeter; Molecular data; Line; identification; MICROWAVE-SPECTRUM; INTERNAL-ROTATION; PROPIONIC-ACID; DIPOLE-MOMENT; AB-INITIO; MILLIMETER; MOLECULES; BARRIER; FORMATE;

D O I：

10.1016/j.jms.2021.111454

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Three compounds with a C3H6O2 formula have been detected in the Interstellar Medium (ISM): ethyl formate (CH3CH2OC(O)H), methyl acetate (CH3OC(O)CH3) and very recently hydroxyacetone (CH3C(O)CH2OH). The higher thermodynamic stability of another isomer, the propanoic acid (CH3CH2C(O)OH), clearly suggests that this molecule should be considered as a possible candidate for ISM detection. To provide reliable predictions for astronomical use in the millimeter and submillimeter wave ranges we performed a new study of propanoic acid rotational spectrum up to 545 GHz. The analysis of large amplitude methyl top torsional motion in this molecule was carried out using the rho axis method and the RAM36 program code. More than 3200 lines corresponding to the rotational transitions in the ground and first excited methyl top torsional states were newly assigned and fit within experimental error. This enabled us to produce new predictions which were used to search for propanoic acid in two high-mass star-forming regions: SgrB2 (public IRAM 30 m) and Orion KL (ALMA Science Verification). We report a non-detection of propanoic acid in these clouds and derive upper limits to the column density.

引用

页数：8

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