Rotational spectra of isotopic species of methyl cyanide, CH3CN, in their v8 = 1 excited vibrational states
作者： Brian J. Drouin , Frank Lewen , Matthias H. Ordu , Holger S. P. Müller , Nadine Wehres
DOI: 10.1051/0004-6361/201527602
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摘要: Context. Methyl cyanide is an important trace molecule in space, especially star-forming regions where it one of the more common molecules used to derive kinetic temperatures. Aims. We want obtain accurate spectroscopic parameters minor isotopologs methyl their lowest excited 38 = 1 vibrational states support astronomical observations, particular, with interferometers such as ALMA. Methods. The laboratory rotational spectrum natural isotopic composition has been recorded from millimeter terahertz regions. Results. Transitions good signal-to-noise ratios could be identified for three species CH13 3 CN, CH3CN, and CH3CN up about 1.2 THz (J′′ ≤ 66). Accurate were obtained all species. Conclusions. present data already instrumental identifying lines 13C IRAM 30 m ALMA toward Sagittarius B2(N).
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