FTIR SPECTRUM OF CARBON-13 SUBSTITUTED $SiC_{2}$ TRAPPED IN ARGON AT 8 K

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1985

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Ohio State University

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The products from vaporizing silicon carbide at 2900 K and quenching in argon at 8 K have been studied using Fourier transform infrared spectroscopy. Two absorptions at 1741.1 and $824.4 cm^{-1}$ have been identified as vibrations of $SiC_{2}$. The appearance of four additional bands at 1708.2, 1674.2, 814.7, and $805.3 cm^{-1}$ upon single and double isotopic substitution with carbon-13 shows conclusively that $SiC_{2}$ possesses $C_{2v}$ symmetry rather than the long assumed $C_{\infty v}$. This result is in agreement with recent results from the rotational analysis of the 498 nm $transition.^{1}$ Furthermore, the mixed isotopic spectra indicate that the 1741 and $824 cm^{-1}$ frequencies should be assigned to the $\nu_{1}$ and $\nu_ 2$ vibrations, respectively. Force constants derived in the present study suggest that this molecule is best understood as a silicon atom singly bonded to two doubly bonded carbon atoms. Implications for upper state vibrational assignments are discussed. Supported by The Robert A. Welch Foundation, Grant p-786.

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$^{1}$D.L. Michalopoulos, M.E. Geusic, P.R.R. Langridge-Smith, R.E. Smalley, J. Chem. Phys. 80, 3556 (1984).
Author Institution: Department of Physics, Texas Christian University; Department of Physics, Texas Christian University

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