**Table 1:** Calculated^a spectroscopic constants for the low-lying v₉=1, v₁₀=1, and v₁₁=1 singly excited bending states of HC₅N.
$\begin{displaymath}\begin{tabular}{ccD{.}{.}{3}D{.}{.}{3}D{.}{.}{3}} \hline\hli... ... & (Hz) & -0.993 & -0.176 & -0.032 \\ % \hline \end{tabular} \end{displaymath}$ ^a CCSD(T)/cc-pVQZ. Standard 2 ${\rm nd}$ order perturbation theory in normal coordinate space is employed in the calculation of $\alpha$ , q_t and q_tJ values.

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