'International Symposium on Molecular Spectroscopy'
Abstract
Methyl isocyanate (CH3NCO) is one of the most abundant species detected on the surface of the 67P/Churyumov-Gerasimenko comet.\footnote{Goesmann, F., Rosenbauer, H., Bredehoft, J.H., et al. 2015, Science, 349, aab0689.} It has also been discovered in space towards the Orion clouds where a large number of rotational lines arising from energy levels with K≤3 were reported.\footnote{Cernicharo, J., Kisiel, Z., Tercero, B., et al. 2016, A\&A, 587, L4.} In the present work, Stark-modulation spectroscopy was used to record the room temperature rotational spectrum of CH3NCO in the spectral region from 32 to 90 GHz and to assign rotational transitions up to K = 10. These new assignments were subsequently followed up to 364 GHz. Also, first laboratory measurements between 50 and 300 GHz have been performed for CH3N13CO and 13CH3NCO isotopologues. Updated extensive line lists along with new sets of spectroscopic parameters provided in this work meet the needs for further detections of CH3NCO in space