# MICROWAVE SPECTRUM, DIPOLE MOMENT, AND STRUCTURE OF THE HCCH-CO DIMER

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 Title: MICROWAVE SPECTRUM, DIPOLE MOMENT, AND STRUCTURE OF THE HCCH-CO DIMER Creators: Germann, T. C.; Tschopp, S. L.; Gutowsky, H. S. Issue Date: 1992 Publisher: Ohio State University Abstract: Rotational spectra have been observed for several $^{13}C/^{18}O$ isotopic species of the pseudolinear acetylene-carbon monoxide dimer using the pulsed, Fourier transform Balle/Flygare microwave spectrometer. Our results complement an earlier report by Legon on the $dimer.^{1}$. A quadrature detection system has been incorporated in the data processing system to avoid folding of the spectrum onto itself in taking the Fourier transform. Dipole moments of 0.3112(12) and 3.29(3) D were determined for the parent species and for HCN-HCCN, respectively. Structural properties were derived from the various measurements, including a well depth of $300 cm^{-1}$ from Dj, and the results are compared with those reported earlier for HCN-HCCH. A substitution analysis is developed in which the rotational properties of the pseudolinear dimer are treated as a symmetric $top^{2}$. A simple method is described for determining effects of the off-axis bending of the monomers. Description: $^{1}$ A.C. Legon, A.L. Wallwork, J.W. Bevan, and Z. Wang, Chem. Phys. Lett. 180 , 57 (1991). $^{2}$A. Haynes and A.C.Legon, J. Mol. Struct. 189, 153 (1988). Author Institution: Department of Chemistry, Harvard University; Noyes Chemical Laboratory, University of Illinois URI: http://hdl.handle.net/1811/12904 Other Identifiers: 1992-TH-03