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 Title: Millimeter-wave Spectroscopy Of S2cl2: A Candidate Molecule For The Detection Of Ortho-para Transition Author(s): Kanamori, Hideto Contributor(s): Mizoguchi, Asao; Dehghani, Zeinab Tafti Subject(s): Fundamental interest Abstract: \chem{S_2Cl_2} is a candidate molecule for the detection of \textit{ortho-para} transition, because the Cl atoms on the skewed position from the rotational principle axes give large off-diagonal terms in the quadrupole interaction, which can mix \textit{ortho} and \textit{para} states. In order to estimate the \textit{ortho-para} mixing in a hyperfine-resolved rotational state, pure rotational transitions were measured by millimeter-wave spectroscopy using two different experimental set-ups. The transitions from the term value around 20 K was measured with a supersonic jet and those around 200 K were measured with a dry ice cooled gas cell. Hundreds of peaks were assigned for the naturally abundant S$_{2}$$^{35}Cl_{2} and S_{2}$$^{35}$Cl$^{37}$Cl isotopic species, and the rotational molecular constants including the fourth-order and sixth-order centrifugal distortion constants were determined. The hyperfine structures were partly resolved in some \textit{Q}-branch transitions and those spectral patterns were well reproduced with the hyperfine constants determined by the previous FTMW spectroscopy in the cm-wave region\footnote{Mizoguchi et al., J. Mol. Spectrosc. 250,86-97(2008)}. With the new molecular constants determined in this study and the previous hyperfine constants, it becomes possible to predict a more reliable \textit{ortho-para} mixing ratio and to narrow down the possible candidate transitions in the mm-wave region for the detection of \textit{ortho-para} transition. Issue Date: 2014-06-19 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Kanamori, H.; Mizoguchi, A.; Dehghani, Z.T. MILLIMETER-WAVE SPECTROSCOPY OF S2Cl2: A CANDIDATE MOLECULE FOR THE DETECTION OF ORTHO-PARA TRANSITION. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.RD04 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50902 DOI: 10.15278/isms.2014.RD04 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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