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Rotational spectra of isotopic species of methyl cyanide, CH sub(3) CN, in their v sub(8)= 1 excited vibrational states
Context. Methyl cyanide is an important trace molecule in space, especially in star-forming regions where it is one of the more common molecules used to derive kinetic temperatures. Aims. We want to obtain accurate spectroscopic parameters of minor isotopologs of methyl cyanide in their lowest excit...
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Published in: | Astronomy and astrophysics (Berlin) 2016-02, Vol.586 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | Context. Methyl cyanide is an important trace molecule in space, especially in star-forming regions where it is one of the more common molecules used to derive kinetic temperatures. Aims. We want to obtain accurate spectroscopic parameters of minor isotopologs of methyl cyanide in their lowest excited [nu]8 = 1 vibrational states to support astronomical observations, in particular, with interferometers such as ALMA. Methods. The laboratory rotational spectrum of methyl cyanide in natural isotopic composition has been recorded from the millimeter to the terahertz regions. Results. Transitions with good signal-to-noise ratios could be identified for the three isotopic species CH sub(3) super(13) CN, super(13) CH sub(3) CN, and CH sub(3) C super(15) N up to about 1.2 THz (J'' [< or =] 66). Accurate spectroscopic parameters were obtained for all three species. Conclusions. The present data were already instrumental in identifying [nu] sub(8)= 1 lines of methyl cyanide with one super(13) C in IRAM 30 m and ALMA data toward Sagittarius B2(N). |
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ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361/201527602 |