# DEUTERATED-ACETYLENE DIMERS: THE TUNNELING MOTIONS OF (DCCD)$_{2}$, (DCCH)$_{2}$, DCCD-DCCH, DCCH-DCCD, HCCH-DCCD, AND HCCH-DCCH FROM THEIR MICROWAVE SPECTRA

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 Title: DEUTERATED-ACETYLENE DIMERS: THE TUNNELING MOTIONS OF (DCCD)$_{2}$, (DCCH)$_{2}$, DCCD-DCCH, DCCH-DCCD, HCCH-DCCD, AND HCCH-DCCH FROM THEIR MICROWAVE SPECTRA Creators: Matsumura, K.; Lovas, F. J.; Suenram, R. D. Issue Date: 1991 Publisher: Ohio State University Abstract: The rotational spectra of deuterated acetylene dimers, which were produced in a molecular beam at 1 K using 1\% mixtures of HCCH, DCCH, and DCCD in Ar, were observed with a pulsed beam Fourier transform microwave spectrometer. All types of the deuterated acetylene dimers in which a D atom participates in the hydrogen-bond were observed, i.e. $(DCCD)_{2}, (DCCH)_{2}$, DCCD-DCCH, DCCH-DCCD, HCCH-DCCD, and HCCH-DCCH. However, we could not detect any form of the mixed H/D dimers in which the hydrogen atom is located in the hydrogen-bond. From the interconversion tunneling spectra, the tunneling potential of (DCCD)$_{2}$ was analyzed by using a one-coordinate model (Fraser et $al.^{1}$) and the potential depth was determined to be $V_{4} = 35.577$ $cm^{-1}$, which is $2.371 cm^{-1}$ deeper than that of $(HCCH)_{2}$ studied by Fraser et $al.^{1}$ Also we applied a modified version of the one-coordinate model was also applied to the other deuterated acetylene dimers. A discussion of the observed spectra and tunneling model will be presented. Description: $^{1}$G. T. Fraser, R. D. Suenram, F. J. Lovas, A. S. Pine, J. T. Hougen, W. J. Lafferty, and J. S. Muenter, J. Chem. Phys. 89, 6028 (1988)."" Author Institution: Seinan Gakuin University; Molecular Physics Division, National Institute of Standards and Technology URI: http://hdl.handle.net/1811/12524 Other Identifiers: 1991-TE-11