THE MICROWAVE VIBRATIONAL SATELLITE SPECTRUM AND EQUILIBRIUM STRUCTURE OF $HCO^{+}$

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1982

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Ohio State University

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The (100), $(02^{\circ}0)$, and (001) vibrational satellites of the J-0-1 rotational transition for the molecular ion $HCO^{+}$ have been observed in an argon DC glow discharge with small amounts of CO and $H_{2}$. These same transitions have also been observed for $H^{13}CO^{+}$ and $HC^{18}O^{+}$ in similar discharges using isotopically enriched $^{13}CO$ or $C^{18}O$, thus confirming the assignment. The vibration-rotation constants Be, $\alpha_{1}, \alpha_{2}$, and $\alpha_{3}$ obtained for each isotopic form agree reasonably well with the ab initio predictions of $Hennig et al,^{1}$, but different pairs of Be used to calculate an equilibrium structure yield structures differing by much more than the estimated experimental uncertainty. A perturbation of the (100) state by an accidental resonance with either the $(04^{\circ}0)$ or the (01'1) could account for this variation. The vibrational temperature of the ion has been estimated from relative intensity measurements to be in range $700^{\circ}-1000^{\circ}$K for all three normal modes.

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$^{1}$P. Hennig, W. P. Kraemer, G. H. F. Diercksen, Max Planck institut Fur Physik und Astrophysik, Munhen, 1978 (unpublished report).

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