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Title:THZ spectroscopy of 1d-ethane: Assignment of ν18
Author(s):Daly, Adam M
Contributor(s):Groner, Peter; Brown, Linda; Drouin, Brian
Subject(s):Planetary atmospheres
Abstract:We have measured$^{a}$ over 130 pure rotational transitions of the lowest torsional state, $\nu$$_{18}$, of C$_{2}$H$_{5}$D using a double pass 3 meter cell held at 0.2 Torr of sample pressure in the frequency ranges of 540-600, 680-800 and 940-1080 GHz. The program ERHAM$^{b}$, Effective Rotational Hamiltonian Method, was used to construct the Hamiltonian that included $\rho$, $\epsilon$$_{1}$, $\beta$, 9 rotational and centrifugal distortion constants and 8 torsional constants. Fitted values of $\epsilon$$_{1}$ = 1127.82(35) MHz, $\rho$ = 0.4342 MHz and $\beta$ = 1.317(22) MHz enable predictions to experimental accuracy of both \textit{a} and \textit{b}-dipole allowed pure rotational transitions which have A - E splittings of 70 MHz and 1.3 GHz respectively. The data, combined with ground state data, will be useful to derive information regarding the potential barrier to internal rotation. This analysis supports our ongoing work to assign the infrared spectrum in the 700-900 cm$^{-1}$ region to enable the first detection in outer planet atmospheres. $^{a}$\textit{Research described in this paper was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contracts and cooperative agreements with the National Aeronautics and Space Administration.} $^{b}$P. Groner \textit{J. Mol. Spec.} 278 (2012) 52-67.
Issue Date:2014-06-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:Daly, A.M.; Groner, P.; Brown, L.; Drouin, B. THZ SPECTROSCOPY OF 1d-ETHANE: Assignment of ν18. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FE07
Genre:Conference Paper / Presentation
Rights Information:Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License.
Date Available in IDEALS:2014-09-17

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