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Published December 1, 1990 | Published
Journal Article Open

The C9 cluster: Structure and infrared frequencies


The high resolution infrared spectrum of the C9 cluster has been measured in direct absorption by infrared diode laser spectroscopy of a pulsed supersonic carbon cluster jet. Fifty-one rovibrational transitions have been assigned to the nu6 (sigmau ) antisymmetric stretch fundamental of the 1Sigma + 9 linear ground state of C9. The measured rotational constant [429.30(50) MHz] is in good agreement with ab initio calculations and indicates an effective bond length of 1.278 68(75) Å, consistent with cumulenic bonding in this cluster. Several perturbations are observed in the upper state, and the upper- and lower-state centrifugal distortion constants are observed to be anomolously large, evidencing a high degree of Coriolis mixing of the normal modes.

Additional Information

© 1990 American Institute of Physics. Received 17 August 1990; accepted 2 September 1990. We would like to thank R.C. Cohen for many stimulating discussions during the course of this work. We would also like to acknowledge the help of R.A. Sheeks. We thank Dr. Jan Martin and Dr. D. Ewing for sending us their respective results prior to publication. J.R.H. thanks the Berkeley Miller Foundation for support. This work was supported by grants by the NASA Innovative Science Grants Program and the ONR CLuster Program (Grant No. N004-90-J-1368).

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