ROTATIONAL COMPONENT FREQUENCY MEASUREMENTS FOR THE GROUND, $v_{10}=1$, and $v_{9}=1$ VIBRATIONAL ENERGY LEVELS OF THE METHYL ACETHYLENE $MOLECULE^{(1)}$

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1984

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Ohio State University

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The rotational spectrum of the methyl acetylene molecule in the region of 17 to 70 gHz was studied in the ground, $v_{9} = 1$, and $v_{10} = 1$ vibrational states. Frequency measurements obtained for the $v_{10} = 1$ and the ground vibrational rotational components were compared to previous measurements and to theoretical results in order to establish the reliability of the instrumentation. Measurements were then made for rotational frequencies of $J = 1 \to 2$ and $J = 3 \to 4$ components in the $v_{9} = 1$ vibrational state. Our measurements on the ground and $v_{10} = 1$ vibrational states are in good agreement with the current theories. However, the $v_{9} = 1$ data does not appear to fit the same model as the $v_{10} = 1$ data. These discrepancies will be discussed. In addition some unassigned rotational transitions were measured in the same frequency range which appear to belong to doubly excited vibrational states. Possible assignments for these spectral components will be discussed.

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$^{1}$ This work supported by grant \#B842 Robert A. Welch Foundation.
Author Institution: Department of Physics, North Texas State University

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