| Issue |
A&A
Volume 504, Number 2, September III 2009
|
|
|---|---|---|
| Page(s) | 635 - 640 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/200912409 | |
| Published online | 09 July 2009 | |
Dimethyl ether: laboratory spectra up to 2.1 THz*
Torsion-rotational spectra within the vibrational ground state
1
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany e-mail: endres@ph1.uni-koeln.de
2
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099, USA
Received:
30
April
2009
Accepted:
4
June
2009
Dimethyl ether (
) is one of the largest
organic molecules detected in the interstellar medium. As an
asymmetric top molecule with two methyl groups which undergo large
amplitude motions and a dipole moment of 
D, it conveys a
dense spectrum throughout the terahertz region and contributes to
the spectral line confusion in astronomical observations at these
frequencies. In this paper, we present rotational spectra of dimethyl
ether in its ground vibrational states, which have been measured in
the laboratory and analyzed covering frequencies up to 2.1 THz. The
analysis is based on an effective Hamiltonian for a symmetric
two-top rotor and includes experimental data published so far.
Frequency predictions are presented up to 2.5 THz for astronomical
applications with accuracies better than 1 MHz.
Key words: ISM: molecules / molecular data / methods: laboratory / techniques: spectroscopic / radio lines: ISM / submillimeter
© ESO, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.