# THE EXPERIMENTAL DETECTION OF $HOC^{+}$ BY MICROWAVE SPECTROSCOPY

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 Title: THE EXPERIMENTAL DETECTION OF $HOC^{+}$ BY MICROWAVE SPECTROSCOPY Creators: Gudeman, Christopher S.; Woods, R. C. Issue Date: 1982 Publisher: Ohio State University Abstract: The J = 0-1 microwave absorption of the metastable isomeric ion $HOC^{+}$ has been detected in DC glow discharges through argon and small amounts of $H_{2}$ and CO. Although several theoretical studies have predicted its structure and chemical properties, no experimental information has existed for $HOC^{+}$ untill the present, thus the microwave search for this elusive species, covering 1.8 GHz, was guided solely by ab initio $predictions.^{1, 2, 3}$ The isotopic variants $HO^{13}C^{+}$ and $H^{18}OC^{+}$ have also been observed using isotopically enriched $^{13}CO$ and $C^{18}O$ in smimilar discharges. The assignment of the spectrum has been based on identical chemical behaviour of each isotopic form; Broad line widths much in excess of those for polar neutrals but similar to that for $HCO^{+}$; isotopic mixing experiments indicating one hydrogen, one carbon, one oxygen, and no nitrogen atoms (e.g. 50% CO and 50% $^{13}CO$ yield a factor of 2 loss in signal strength); and the absence of any Zeeman effect or apparent hyperfine structure. Using the moment of inertia for each isotopic form, the $r_{6}$ CO bond distance has been calculated and found to be in excellent agreement with the best ab initio CI $predictions.^{1-3}$ The apparent $r_{8}$ OH bond distance obtained from the center of mass condition, however, was nearly .06 A shorter than the CI result. A large amplitude, low frequency bending motion or possibly quasilinearity is thought to be the cause of this gross discrepancy. Description: $^{1}$P. Hennig, W. P. Kraemer, G. H. F. Diercksen, Max Planck Institut Fur Physik and Astrophysik, Munchen, 1978 (unpublished report). $^{2}$R. H. Nobes and L. Radom, Chem. Phys., 60 (1981)1. $^{3}$E. Herbst, J. M. Norbeck, P. R. Certain, and W. Klemperer, Astrophya. J., 207 (1976)110. URI: http://hdl.handle.net/1811/28984 Other Identifiers: 1982-TB-9