Millimeter-wave Spectroscopy Of S2cl2: A Candidate Molecule For The Detection Of Ortho-para Transition

Kanamori, Hideto

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https://hdl.handle.net/2142/50902 Copy

Description

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

Issue Date

2014-06-19

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50902

DOI

https://doi.org/10.15278/isms.2014.RD04

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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