| Issue |
A&A
Volume 398, Number 2, February I 2003
|
|
|---|---|---|
| Page(s) | L11 - L13 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20021849 | |
| Published online | 21 January 2003 | |
Letter to the Editor
The millimeter-wave spectrum and the dipole moment of vinylacetylene *
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
Corresponding author: S. Thorwirth, sven@ph1.uni-koeln.de
Received:
20
November
2002
Accepted:
15
December
2002
The pure rotational spectrum of the hydrocarbon vinylacetylene
(1-butene-3-yne, 
) in its ground vibrational
state has been investigated from 80 to 165 GHz, covering the
rotational quantum numbers 
and 
,
in order to provide accurate rest frequencies for radioastronomical
searches. Moreover, quantum chemical calculations of the dipole moment
components 
and 
have been performed leading to the
result 
D. The value for the dipole moment component is very low and lies in the range of several thousandth to a
few hundredth of a Debeye.
Key words: molecular data / methods: laboratory / techniques: spectroscopic / stars: AGB and post-AGB
© ESO, 2003
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