Laboratory Detection of Two New C_5H_2 Isomers

Details Laboratory Detection of Two New C_5H_2 Isomers Laboratory Detection of Two New C_5H_2 Isomers

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...509l.141g&link_type=abstract

The Astrophysical Journal, Volume 509, Issue 2, pp. L141-L144.

Astronomy and Astrophysics

Astronomy

13

Ism: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: Ism

Scientific paper

Two new isomers of the C_5H_2 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 C_5H_2 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 C_3H_2 ring, which is one of the most abundant interstellar molecules.

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