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

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/12524

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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.
URI: http://hdl.handle.net/1811/12524
Other Identifiers: 1991-TE-11
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