MICROWAVE SPECTROSCOPY OF ISOTHIAZOLE

Kobayashi, Kaori

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https://hdl.handle.net/2142/116835 Copy

Description

Title

MICROWAVE SPECTROSCOPY OF ISOTHIAZOLE

Author(s)

Kobayashi, Kaori

Contributor(s)

McMahon, Robert J.; Woods, R. Claude; Esselman, Brian J. ; Zdanovskaia, Maria ; Furukawa, Hoga

Issue Date

2022-06-21

Keyword(s)

Rotational structure/frequencies

Abstract

Recently, cyclic molecules such as benzonitrile \footnote{B.A. McGuire, A.M. Burkhardt, S. Kalenskii, C.N. Shingledecker, A.J. Remijan, E. Herbst, M.C. McCarthy, \textit{Science} \underline{\textbf{359}}, 202 (2018).} and 2-cyanocyclopentadiene \footnote{M.C. McCarthy, K.L.K. Lee, R.A. Loomis, A.M. Burkhardt, C.N. Shingledecker, S.B. Charnley, M.A. Cordiner, E. Herbst, S. Kalenskii, E.R. Willis, C. Xue, A.J. Remijan, B.A. McGuire, \textit{Nat. Astron.} \underline{\textbf{5}}, 176 (2021).} have been discovered in the interstellar medium. Cyclic molecules with large dipole moments are considered good candidates for future search. Isothiazole (C$_3$H$_3$NS) is a five-membered ring molecule with two adjacent hetero atoms, nitrogen and sulfur. Previous studies of millimeter-wave spectroscopy have been conducted below 35 GHz \footnote{J.H. Griffiths, A. Wardley, V.E. Williams, N.L. Owen, and J. Sheridan, \textit{Nature} \underline{\textbf{216}}, 1301 (1967).}$^,$ \footnote{J. Wiese, D.H. Sutter, \textit{Z. Naturforsch. A} \underline{\textbf{35}}, 712 (1980).}$^,$ \footnote{. Gripp, U. Kretschmer, H. Dreizler \textit{Z. Naturforsch. A} \underline{\textbf{49}}, 1059 (1994).}, and data at higher frequencies are desired. Therefore, we performed a new measurement in the region of 40-360 GHz at room temperature. The ground state, and the vibrational excited states ($\nu_{18}=1$, $\nu_{17}=1$, $\nu_{13}=1$, $\nu_{16}=1$, $\nu_{12}=1$, $\nu_{11}=1$, $\nu_{15}=1$, $\nu_{10}=1$, and $\nu_{14}=1$) were analyzed by using AABS \footnote{Z. Kisiel, L. Pszcz{\'{o}}{\l}kowski, I. R. Medvedev, M. Winnewisser, F. C. De Lucia, E. Herbst, \textit{J.Mol.Spectrosc.} \underline{\textbf{233}}, 231 (2005).}, and SPFIT/SPCAT \footnote{H. M. Pickett, \textit{J.Mol.Spectrosc.} \underline{\textbf{148}}, 371 (1991).} packages. More than 10000 lines were assigned and analyzed using Watson’s A-reduced Hamiltonian.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116835

Copyright and License Information

Copyright 2022 held by the authors

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