THE ETHYNYL RADICAL (CCH) DETECTED BY LASER MAGNETIC RESONANCE

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 Title: THE ETHYNYL RADICAL (CCH) DETECTED BY LASER MAGNETIC RESONANCE Creators: Saykally, R. J.; Evenson, K. M. Issue Date: 1978 Publisher: Ohio State University Abstract: We have detected absorptions at 490 $\mu m$ by a new” transient paramagnetic molecule generated in several hydrocarbon-fluorine atom flames in a $CO_{2}$-pumped far-infrared laser magnetic resonance spectrometer. The new species has been tentatively established through isotopic substitution experiments to be the $\sigma$-radical CCH $(X^{2}\Sigma^{-})$- previously detected $^{1}$ in interstellar gas clouds and in rare gas matrices, but never before observed terrestrially in the gas phase. The strongest CCH absorptions have been produced in a $CH_{4}$ -F flame under conditions which also yield intense magnetic resonance spectra from CH and $CH_{2}$. Additional transitions are being sought and analysis of the 490 $\mu m$ spectrum is underway. Description: $^{1}$K. D. Tucker, K. L. Kutner, and P. Thaddeus, Astrophys. J. 193, L115 (1974)."" Author Institution: National Bureau of Standards URI: http://hdl.handle.net/1811/10360 Other Identifiers: 1978-FB-08