A Comprehensive Intensity Study Of The Ν4 Torsional Band Of Ethane

Moazzen-Ahmadi, Nasser

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https://hdl.handle.net/2142/50863 Copy

Description

Title

A Comprehensive Intensity Study Of The Ν4 Torsional Band Of Ethane

Author(s)

Moazzen-Ahmadi, Nasser

Contributor(s)

• Devi, V. Malathy
• Wishnow, Edward H.
• Brown, Linda
• Crawford, Timothy J.
• Sung, Keeyoon
• Ozier, Irving
• Norooz Oliaee, Jalal

Issue Date

2014-06-19

Keyword(s)

Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA

Abstract

The torsional spectrum of C$_2$H$_6$ has been investigated from 220 to 330 cm$^{-1}$ to measure the intensity of the fundamental and the first torsional hot band needed for atmospheric studies of Titan. Several spectra were measured at resolutions of 0.01 and 0.02 cm$^{-1}$ using the JPL Bruker IFS-125 coupled to a coolable multi-pass absorption cell originally developed at University of British Columbia.\footnote{E. H. Wishnow, A. Leung, and H. P. Gush, Rev. Sci. Instr., 70, 23 (1999).} Spectra were recorded at several temperatures from 293 K to 166 K, with the lower temperatures relevant to the stratosphere of Titan. Because this spectrum is very weak, a long absorption path of 52 m was used along with substantial sample pressures from 35 to 255 Torr. Intensities were analysed using a quantum mechanical model reported previously.\footnote{N. Moazzen-Ahmadi, A.R.W. McKellar, J.W.C. Johns, and I.Ozier, J. Chem. Phys. 97, 3981 (1992).} The torsional fundamental of C$_2$H$_6$ is observed in the CIRS spectra of Titan. Line parameters for the torsional bands are required for accurate characterization of spectral features of Titan’s far-infrared region. The current study should lead to a better understanding of the methane cycle in planetary atmospheres and permit the identification of the other molecular features in the CIRS data.\footnote{Research described in this paper was performed, in part, at the Jet Propulsion Laboratory, California Institute of Technology under contracts and cooperative agreements with the NASA.The data were obtained using NASA’s OPR Grant awarded to the College of William and Mary. The research conducted at the University of Calgary is supported by the Canadian Space Agency.}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50863

DOI

https://doi.org/10.15278/isms.2014.RA09

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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