THZ spectroscopy of 1d-ethane: Assignment of ν18

Daly, Adam M

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https://hdl.handle.net/2142/50832 Copy

Description

Title

THZ spectroscopy of 1d-ethane: Assignment of ν18

Author(s)

Daly, Adam M

Contributor(s)

• Groner, Peter
• Brown, Linda
• Drouin, Brian

Issue Date

2014-06-20

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50832

DOI

https://doi.org/10.15278/isms.2014.FE07

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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