Rotational spectrum of isotopic methyl mercaptan, 13CH3SH, in the laboratory and towards Sagittarius B2(N2)

被引:5
作者
Ilyushin, Vadim V. [1 ,2 ]
Zakharenko, Olena [3 ]
Lewen, Frank [3 ]
Schlemmer, Stephan [3 ]
Alekseev, Eugene A. [1 ,2 ]
Pogrebnyak, Mykola [1 ,2 ]
Lees, Ronald M. [4 ]
Xu, Li-Hong [4 ]
Belloche, Arnaud [5 ]
Menten, Karl M. [5 ]
Garrod, Robin T. [6 ,7 ]
Mueller, Holger S. P. [3 ]
机构
[1] Inst Radio Astron NASU, Mystetstv 4, UA-61002 Kharkiv, Ukraine
[2] Kharkov Natl Univ, Quantum Radiophys Dept, Svobody Sq 4, UA-61022 Kharkiv, Ukraine
[3] Univ Cologne, Phys Inst 1, Zulpicher Str 77, D-50937 Cologne, Germany
[4] Univ New Brunswick, Dept Phys, St John, NB, Canada
[5] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[6] Univ Virginia, Dept Chem, Charlottesville, VA USA
[7] Univ Virginia, Dept Astron, Charlottesville, VA 22903 USA
关键词
methyl mercaptan; interstellar molecule; microwave spectroscopy; torsion-rotation Hamiltonian; MILLIMETER-WAVE SPECTRUM; SUBMILLIMETER SPECTRUM; SPECTROSCOPY; CHEMISTRY; BARRIER; STATES;
D O I
10.1139/cjp-2019-0421
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Methyl mercaptan (CH3SH) is a known interstellar molecule with abundances high enough that the detection of some of its minor isotopologues is promising. The present study aims to provide accurate spectroscopic parameters for the (CH3SH)-C-13 isotopologue to facilitate its identification in the interstellar medium at millimetre and submillimetre wavelengths. Through careful analysis of recent CH3SH spectra from 49-510 GHz and 1.1-1.5 THz recorded at natural isotopic composition, extensive assignments were possible not only for the ground torsional state of (CH3SH)-C-13, but also in the first and second excited states. The torsion-rotation spectrum displays complex structure due to the large-amplitude internal rotation of the (CH3)-C-13 group, similar to the main and other minor isotopic species of methyl mercaptan. The assigned transition frequencies have been fitted to within experimental error with a 52-parameter model employing the RAM36 programme. With predictions based on this fit, (CH3SH)-C-13 was searched for in spectra from the Atacama Large Millimetre/sub-millimetre Array (ALMA) towards the Galactic centre source Sgr B2(N2). Several transitions were expected to be observable, but all of them turned out to be severely blended with emission from other species, which prevents us from identifying (CH3SH)-C-13 in this source.
引用
收藏
页码:530 / 537
页数:8
相关论文
共 58 条
[1]   A sensitive λ3 mm line survey of L483 A broad view of the chemical composition of a core around a Class 0 object [J].
Agundez, M. ;
Marcelino, N. ;
Cernicharo, J. ;
Roueff, E. ;
Tafalla, M. .
ASTRONOMY & ASTROPHYSICS, 2019, 625
[2]  
Alekseev E. A., 2012, RADIO PHYS RADIO AST, V3, P75, DOI [10.1615/RadioPhysicsRadioAstronomy.v3.i1.100, DOI 10.1615/radiophysicsradioastronomy.v3.i1.100]
[3]  
[Anonymous], MOL SPAC
[4]   Exploring molecular complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2) [J].
Belloche, A. ;
Mueller, H. S. P. ;
Garrod, R. T. ;
Menten, K. M. .
ASTRONOMY & ASTROPHYSICS, 2016, 587
[5]   Detection of a branched alkyl molecule in the interstellar medium: iso-propyl cyanide [J].
Belloche, Arnaud ;
Garrod, Robin T. ;
Mueller, Holger S. P. ;
Menten, Karl M. .
SCIENCE, 2014, 345 (6204) :1584-1587
[6]   Isotopic compositions of the elements 2009 (IUPAC Technical Report) [J].
Berglund, Michael ;
Wieser, Michael E. .
PURE AND APPLIED CHEMISTRY, 2011, 83 (02) :397-410
[7]   The millimeter- and submillimeter-wave spectrum of methyl mercaptan (CH3SH) [J].
Bettens, FL ;
Sastry, KVLN ;
Herbst, E ;
Albert, S ;
Oesterling, LC ;
De Lucia, FC .
ASTROPHYSICAL JOURNAL, 1999, 510 (02) :789-794
[8]   Laboratory spectroscopy of 1, 2-propanediol at millimeter and submillimeter wavelengths [J].
Bossa, J-B. ;
Ordu, M. H. ;
Mueller, H. S. P. ;
Lewen, F. ;
Schlemmer, S. .
ASTRONOMY & ASTROPHYSICS, 2014, 570
[9]   Millimetre-wave spectrum of anti-13C1 and 13C2 isotopologues of ethanol [J].
Bouchez, Aurelia ;
Walters, Adam ;
Mueller, Holger S. P. ;
Ordu, Matthias ;
Lewen, Frank ;
Koerber, Monika ;
Bottinelli, Sandrine ;
Endres, Christian P. ;
Schlemmer, Stephan .
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 2012, 113 (11) :1148-1154
[10]   DISCOVERY OF THE METHOXY RADICAL, CH3O, TOWARD B1: DUST GRAIN AND GAS-PHASE CHEMISTRY IN COLD DARK CLOUDS [J].
Cernicharo, J. ;
Marcelino, N. ;
Roueff, E. ;
Gerin, M. ;
Jimenez-Escobar, A. ;
Munoz Caro, G. M. .
ASTROPHYSICAL JOURNAL LETTERS, 2012, 759 (02)