# DETECTION OF THE $N=2\to 3$ ROTATIONAL TRANSITION OF ETHYNYL (CCH) IN $ORION^{*}$

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 Title: DETECTION OF THE $N=2\to 3$ ROTATIONAL TRANSITION OF ETHYNYL (CCH) IN $ORION^{*}$ Creators: Zuirys, L. M.; Saykally, R. J.; Plambeck, Richard L.; Erickson, N. Issue Date: 1981 Publisher: Ohio State University Abstract: The first laboratory detection of the ethynyl radical (CCH) in the gas phase was reported in 1979 by Saykally and $Evenson,^{1}$ who used far-infrared laser magnetic resonance to observe the $N = 6\rightarrow 7$ pure rotational transition of CCH in its $^{2}\sum$ ground state. A recent analysis of this spectrum has yielded an estimate of the centrifugal distortion constant. $D_{0}$, which enables us to predict all other rotational transitions with sufficient accuracy for radioastronomical searches. Using Erickson’s 200-300 GHz quasi-optical receiver at the Millimeter Wave Observatory of the University of Texas, we have detected the $N = 3 \rightarrow 2$ emission spectrum of CCH in several interstellar sources. Analysis of this spectrum in conjunction with $earlier^{2}$ astronomical results will be reported. Description: $^{1}$ R. J. Saykally and K. M. Evenson, 33rd Annual Symposium on Molecular Spectroscopy, Columbus, Ohio (1978). Paper FB-8. $^{2}$ K. D. Tucker, M. L. Kutner, and P. Thaddeus, Astrophys. J. 193, L115 (1974). $^{*}$ Supported by NSF Grant $\#CHE-8007042$. Author Institution: URI: http://hdl.handle.net/1811/11624 Other Identifiers: 1981-RF-12