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 Title: THE COMPLETE ROTATIONAL SPECTRUM OF CH3NCO UP TO 376 GHz Author(s): Kisiel, Zbigniew Contributor(s): De Lucia, Frank C.; Winnewisser, Manfred; Fortman, Sarah; Medvedev, Ivan; Alonso, José L.; Kolesniková, Lucie Subject(s): Large amplitude motions, internal rotation Abstract: The methylisocyanate molecule, CH$_3$NCO, is of interest as a potential astrophysical species and as a model system for the study of quasisymmetric behavior. The rotational spectrum is made very complex by the presence in CH$_3$NCO of two large-amplitude motions: an almost free internal rotation and a low barrier skeletal bending motion. This challenging spectrum has, nevertheless, been assigned at 8-38 GHz by Stark spectroscopyfootnote{J.Koput, {it J.~Mol.~Spectrosc.} {bf 115}, 131 (1986).} and has been measured at 117-376 GHz with the broadband FASSST technique.footnote{Z.Kisiel et al., 65$^{th}$ OSU Symposium on Molecular Spectroscopy, The Ohio State University, Ohio 2010, RC-13.} vspace{0.2cm} We presently report the results of measuring this spectrum also in supersonic expansion for the transitions below 40 GHz, and at room-temperature in the region between 40 and 120 GHz. In this way we are finally able to confirm the assignment of the ground state and of the internal rotation $m$=1 state and to analyse the nitrogen hyperfine splitting structure. It is also possible to confidently transfer the Stark-based assignment to the transition sequences measured in the mm-wave region, and to assign high $K_a$ sequences. Various models for fitting this spectrum are explored but, even without more extensive fits, we are now able to present temperature scalable linelists for astrophysical applications. Issue Date: 23-Jun-15 Publisher: International Symposium on Molecular Spectroscopy Citation Info: ACS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/79156 Date Available in IDEALS: 2016-01-05
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