Gas-phase detection of discharge-generated DSOD |
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Authors: | Markus Behnke Jan Suhr Frank Lewen Josef Hahn Koichi MT Yamada |
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Institution: | a Department of Physics, The Ohio State University, Columbus, OH 43210, USA b Institut für Anorganische Chemie, Universität zu Köln, Greinstr. 6, D-50939 Cologne, Germany c I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Cologne, Germany d Institut für Physikalische Chemie, Universität Mainz, D-55099 Mainz, Germany e Institute for Environmental Management Technology, AIST Onogawa 16-1, Tsukuba 305-8569, Japan |
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Abstract: | We report the first spectroscopic detection of perdeuterated 1-oxadisulfane, DSOD, generated in a radio-frequency plasma of D2S and D2O. The chain molecule DSOD produces a perpendicular-type spectrum, with well-known spectral features encountered in previous studies of geometrically related molecules, such as compact Q-branches, which are clearly recognizable. The arrangement of the transitions shaping the Q-branches usually provides sufficient proof for a clear-cut detection of a chain molecule such as DSOD. Guided by quantum chemical calculations, we have located the band center of the -branch of DSOD in the frequency region near 466.5 GHz using the Cologne terahertz spectrometer. This -branch displays both b- and c-type spectra, quite analogous to the behavior of the corresponding -branch of HSOH. In addition, we have been able to detect an internal rotational splitting of ∼0.5 MHz for c-type transitions of the -branch, which lends independent support to our present assignment. From the measurements performed on Q-branches, we derive the following differences in rotational constants: A−(B+C)/2=93331.001(15) MHz, and (B−C)/4=172.95923(29) MHz, in excellent agreement with theoretical predictions. |
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Keywords: | DSOD Oxadisulfane-d2 Plasma chemistry High resolution spectroscopy |
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