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Published February 15, 1991 | Published
Journal Article Open

The structure of the C4 cluster radical


The first infrared spectrum of gas phase, jet-cooled C4 has been measured by high resolution diode laser absorption spectroscopy. Twelve rovibrational transitions are assigned to the nu3(sigmau) antisymmetric stretch of linear 3Sigma - g C4. No evidence is observed for the bent structure of triplet C4 recently observed in a matrix study by Cheung and Graham [J. Chem. Phys. 91, 6664 (1989)]. Indeed, the measured band origin (1548.9368(21) cm^–1) and effective ground state C–C bond length [1.304 31(21)A] are consistent with several ab initio predictions of a rigid, linear, cumulenic structure for this cluster radical.

Additional Information

© 1990 American Institute of Physics (Received 9 November 1990; accepted 10 December 1990) This work was supported by grants from the NASA Innovative Science Grants Program (Grant No. NAGW.1022) and by the ONR Cluster Program (Grant No. N004-90-J-1368). J.R.H. is supported by the NASA SETI foundation. We thank Dr. Jan Martin for sending us his results prior to publication. We would also like to thank Dr. Sherwood Chang and Dr. Jill Tartar for their continued interest in this project.

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