VIBRATIONAL-ROTATIONAL INTERACTIONS IN THE INFRARED SPECTRUM OF $C_{2}D_{2}$.

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1969

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Ohio State University

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The infrared spectrum of dideuteroacetylene, $C_{2}D_{2}$, is considerably complicated by the presence of numerous ``hot'' bands originating from the two low-lying levels, $0001^{1}0^{0} (\Pi_{g})$ and $0000^{0}1^{1} (\Pi_{u})$. Rotational analysis of these ``hot'' bands brought to light strong interactions among states with $(v_{4} + v_{5})\geqslant 2$: for example, in the group of interacting states $0002^{0}0^{0}, 0002^{2}0^{0}, 0000^{0}2^{0}$, and $0000^{0}2^{2}$, the separation between $0002^{0}0^{0}$ and $0002^{2}0^{0}$ is only $\sim 0.35 cm^{-1}$ resulting in a very strong perturbation of the rotational levels of the $\Delta_{g}(c)$ and $\Sigma^{+}_{g}$ states (the $\Delta_{g}(d)$ state shows regular behaviour). Transitions involving $\Sigma^{-}_{u}$ and $\Sigma^{-}_{g}$ states have also been identified for the first time in a vibrational-rotational spectrum.
Author Institution: Division of Pure Physics, National Research Council of Canada; Department of Physics, The Ohio State University

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