Heath, J. R. and Saykally, R. J. (1991) Infrared laser absorption spectroscopy of the nu4(sigmau) fundamental and associated nu11(piu) hot band of C7: Evidence for alternating rigidity in linear carbon clusters. Journal of Chemical Physics, 94 (3). pp. 1724-1729. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:HEAjcp91a
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The first characterization of the bending potential of the C7 cluster is reported via the observation of the v=11 and v=20 levels of the nu11(piu) bend as hot bands associated with the nu4(sigmau) antisymmetric stretch fundamental. The lower state hot band rotational constants are measured to be 1004.4(1.3) and 1123.6(9.0) MHz, constituting a 9.3% and 22% increase over the ground state rotational constant [918.89(41) MHz]. These large increases are strong evidence for extremely large amplitude, anharmonic bending modes in this cluster. In addition, quartic and sextic centrifugal distortion constants determined for the ground and nu4=1 states are found to be anomalously large and negative, evidencing strong perturbations between stretching and bending modes.
|Additional Information:||© 1991 American Institute of Physics. Received 23 August 1990; accepted 15 October 1990. We are indebted to R.Cohen for many stimulating discussions and to Dr. D. Ewing and Dr. J. Martin for sending us their respective results prior to publication. We should also like to acknowledge the assistance of J. Kim and R. Sheeks. This work was funded in part by the Office of Naval Research (Grant No. N004-90-J-1368) and the NASA Innovative Science Program. J.R.H. thanks the Miller Foundation for support. [J.R.H. was a] U.C. Berkeley Miller Research Fellow, 1988-1990.|
|Subject Keywords:||ABSORPTION SPECTRA, INFRARED SPECTRA, LASER RADIATION, ATOMIC CLUSTERS, CARBON, MOLECULAR STRUCTURE, VIBRATIONAL STATES|
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|Deposited On:||06 Jun 2008|
|Last Modified:||25 Apr 2017 19:57|
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