Laboratory Detection of Two New C5H2 Isomers

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Gottlieb, C.A.
McCarthy, M.C.
Gordon, Vernita D.
Chakan, J. M.
Apponi, A.J.
Thaddeus, P.

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The Astrophysical Journal


Two new isomers of the C5H2 molecule have been detected in the laboratory, and their microwave spectra have been characterized to high accuracy. Both are good candidates for radio astronomical detection. Like the two isomers previously detected in the laboratory, both are closed-shell carbenes, and both are extremely polar and fairly stable. The first, calculated to lie 0.73 eV above isomer 1, the C5H2 ring-chain ground state, has a bent carbon chain backbone with single, double, and triple bonds; the second, calculated to lie only 0.19 eV higher in energy, is a new type of ring chain formed by adding a pair of doubly bonded carbon atoms to the top of the C3H2 ring, which is one of the most abundant interstellar molecules. Subject headings: ISM: molecules—line: identification—molecular data—molecular processes— radio lines: ISM



Vernita Gordon (currently with UT Austin) -- All authors are with the Division of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138. – M.C. McCarthy, A. J. Apponi, and P. Thaddeus are with the Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.

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Conrad, Jacinta C., Maxsim L. Gibiansky, Fan Jin, Vernita D. Gordon, Dominick A. Motto, Margie A. Mathewson, Wiktor G. Stopka, Daria C. Zelasko, Joshua D. Shrout, and Gerard C.L. Wong. “Flagella and Pili-Mediated Near-Surface Single-Cell Motility Mechanisms in P. Aeruginosa.” Biophysical Journal 100, no. 7 (n.d.): 1608–16. Accessed September 26, 2014. doi:10.1016/j.bpj.2011.02.020.
“Laboratory Detection of Two New C5H2 Isomers - Abstract - The Astrophysical Journal Letters - IOPscience.” Accessed September 26, 2014.