ROTATIONAL SPECTRA OF ISOTOPIC CH$_3$CN IN THEIR $v_8 = 1$ EXCITED VIBRATIONAL STATES
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Date
2013
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Publisher
Ohio State University
Abstract
Methyl cyanide, CH$_3$CN, is an important interstellar molecule, in particular in hot and dense molecular cores, and it may play a role in the atmospheres of planets or of Titan. Therefore, we have recorded extensive rotational spectra up to $\sim 1.6$~THz. Ground state rotational transitions of a number of minor isotopologs could be identified up to 1.2~THz in natural isotopic composition, including CH$_2$DCN and $^{13}$CH$_3 ^{13}$CN. \textbf{506} (2009) 1187.} Recently, we have analyzed the rotational spectra of $^{13}$CH$_3$CN, CH$_3 ^{13}$CN, and CH$_3$C$^{15}$N in their $v_8 = 1$ excited vibrational states from spectra covering most of the frequencies between 0.44~THz and 1.20~THz. The analyses of the $^{15}$N and $^{13}$C species were facilitated by previous data up to 144~GHz and 56~GHz, respectively. Spectroscopic parameters determined in the fits will be compared with those of the main isotopolog. The importance of these results, in particular for radio-astronomical observations with the Atacama Large Millimeter Array (ALMA), will be stressed by the detection of transitions pertaining to the $^{13}$C species in Sagittarius~B2(N).
Description
Author Institution: I. Physikalisches Institut, Universitat zu Koln, 50937 Koln, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA; Max-Planck Institut fur Radioastronomie, 53121 Bonn, Germany