MICROWAVE SPECTRA OF THE 2,4-PENTADIYNE RADICAL, $H_{2}C-C\equiv C-C\equiv C-H$
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Date
1998
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Publisher
Ohio State University
Abstract
The $H_{2}C-C\equiv C-C\equiv C-H$ radical was produced in a pulsed discharge supersonic jet and studied by Fourier transform microwave spectroscopy. Four rotational transitions of the radical from $N_{upper} = 2$ to 5 in the $K_{a} = 0$ ladder were observed between 8 and 21 GHz. A total of 36 hyperfine components were measured and assigned. Seven spectroscopic constants, including rotational and centrifugal distortion constants, the spin-rotation constant, and hyperfine coupling constants for the methylenic and acetylenic hydrogens, were determined. These spectroscopic constants of 2,4-pentadiyne will be compared with those of its isoelectronic analog, $H_{2}C-C\equiv C-C\equiv N$, and with those of the propargyl radical, $H_{2}C-C\equiv C-H$.
Description
Author Institution: Harvard-Smithsonian Center for Astrophysics; Department of Chemistry, Wesleyan University; Harvard-Smithsonian Center for Astrophysics, Wesleyan University; Division of Engineering and Applied Sciences, Harvard University; Division of Engineering and Applied Sciences, Harvard University