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Astron. Astrophys. 357, L65-L67 (2000)

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Letter to the Editor

Submillimeter-wave spectrum of the ethynyl radical, CCH, up to 1 THz

H.S.P. Müller, T. Klaus and G. Winnewisser

Universität zu Köln, I. Physikalisches Institut, Zülpicher Strasse 77, 50937 Köln (hspm@zeus.ph1.uni-koeln.de)

Received 3 April 2000 / Accepted 17 April 2000

Abstract

The [FORMULA] to [FORMULA] pure rotational transitions of CCH, [FORMULA], were measured in the laboratory between 611 and 961 GHz. The radical was produced in a dc glow discharge of a mixture of helium and acetylene. The electron spin-rotation splitting was resolved. The new line frequencies were fit together with previously published data, providing greatly improved spectroscopic constants, such as B = 43 647.529 01 (115) MHz, as well as precise rest frequencies well beyond 1 THz.

Key words: molecular data – methods: laboratory – techniques: spectroscopic – ISM: clouds – ISM: molecules – radio lines: ISM

Send offprint requests to: H.S.P. Müller

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© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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