Further analysis of the laboratory rotational spectrum of CH3NCO

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https://hdl.handle.net/2142/91164

Author(s)

Kisiel, Zbigniew

Contributor(s)

Issue Date

2016-06-22

Keyword(s)

Spectroscopy of Large Amplitude Motions

Abstract

Identification by the Rosetta mission that CH$_3$NCO is among the more plentiful molecules on the surface of the comet Churyumov-Gerasimenko stimulated rapid detection of this molecule in the interstellar medium.\footnote{D.T.Halfen, V.V.Ilyushin, L.Ziurys, {\it ApJ} {\bf 812}, L5 (1915).}$^,$\footnote{J.Cernicharo, Z.Kisiel, B.Tercero, et al., {\it A\&A} {\bf 587}, L4 (2016).} In particular, we have been successful in detecting almost 400 lines of CH$_3$NCO in Orion$^b$ by extending the Koput\footnote{J.Koput, {\it J.~Mol.~Spectrosc.} {\bf 115}, 131 (1986).} cm-wave assignment to frequencies relevant to mm-wave radio-telescopes through measurement of the complete laboratory spectrum up to 363 GHz.$^{b,}$\footnote{Z.Kisiel et al., 65$^{th}$ ISMS, Columbus, Ohio, RC-13 (2010)
\, 70$^{th}$ ISMS, Champaign-Urbana, Illinois, TG-08 (2015).} \vspace{0.2cm} Presently, we describe further progress in understanding the laboratory rotational spectrum of CH$_3$NCO. Assignment has been extended to transitions with $K>3$ by analysis of Stark and hyperfine patterns of the corresponding lowest-$J$ transitions. Broadband spectra of synthezised pure $^{13}$CH$_3$NCO and CH$_3$N$^{13}$CO isotopic species have also been recorded and assigned. Furthermore, the progress in fitting this very low barrier and highly perturbed internal rotation spectrum is described.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

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http://hdl.handle.net/2142/91164

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