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TOWARDS UNDERSTANDING QUANTUM MONODROMY IN QUASI-SYMMETRIC MOLECULES: FASSST ROTATIONAL SPECTRA OF CH$_3$NCO AND CH$_3$NCS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/46400

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Title: TOWARDS UNDERSTANDING QUANTUM MONODROMY IN QUASI-SYMMETRIC MOLECULES: FASSST ROTATIONAL SPECTRA OF CH$_3$NCO AND CH$_3$NCS
Creators: Kisiel, Zbigniew; Fortman, Sarah; Medvedev, Ivan R.; Winnewisser, Manfred; De Lucia, Frank C.; Koput, Jacek
Issue Date: 2010
Abstract: The recent studies of the rotational spectrum of the NCNCS molecule {\bf 95}. 243002 (2005).}$^,$ {\bf 798}, 1 {2006}.}$^,$ DOI:10.1039/B922023B (2010).} demonstrated the success of quantum monodromy in describing the quasilinear behavior of this molecule, inclusive of the abrupt transition of spectroscopic behavior from the bent to the linear molecule regime. Similar, quasisymmetric behaviour, is known to be present in symmetric top molecules, and has been studied at lowest-$J$ transitions for two such molecules, CH$_3$NCO {\bf 115}, 131 (1986).} and CH$_3$NCS. {\bf 118}, 189 (1986).} \vspace{0.2cm} Further progress requires more experimental data and presently we report FASSST rotational spectra of CH$_3$NCO and CH$_3$NCS. The spectra provide practically continuous 117-376 GHz coverage and are very rich, since the ladder of excited vibrational states associated with the qusilinear bending coordinate is multiplied by the nearly free internal rotation of the methyl group. Initial stages of the analysis leading up to an analysis in an extension of the framework used for NCNCS are described.
URI: http://hdl.handle.net/1811/46400
Other Identifiers: 2010-RC-13
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