Submillimeter-wave spectrum of the ethynyl radical, CCH, up to 1 THz
Abstract
The N = 7 <- 6 to 11 <- 10 pure rotational transitions of CCH, X 2 Sigma +, 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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2000
- Bibcode:
- 2000A&A...357L..65M
- Keywords:
-
- MOLECULAR DATA;
- METHODS: LABORATORY;
- TECHNIQUES: SPECTROSCOPIC;
- ISM: CLOUDS;
- ISM: MOLECULES;
- RADIO LINES: ISM