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 Title: HIGH-RESOLUTION GIGAHERTZ AND TERAHERTZ SPECTROSCOPY OF THE ISOTOPICALLY CHIRAL MOLECULE TRANS-2,3-DIDEUTERO-OXIRANE(c-CHD-CHDO) Author(s): Chen, Ziqiu Contributor(s): Trapp, Oliver ; Schurig, Volker ; Quack, Martin ; Keppler, Karen ; Albert, Sieghard Subject(s): Astronomy Abstract: We report the observation and assignment of the rotational spectra of the isotopically chiral molecule, trans-2,3-dideutero-oxirane (c-CHD-CHDO) measured in the Gigahertz range of 62-110 GHz and in the Terahertz range, 25-80 \wn (instrumental resolution of 0.00052 \wn). Normal oxirane (c-C$_2$H$_4$O) has been detected by astrophysical spectroscopy in space.$\footnote{J. E. Dickens, et al., \emph{ApJ}, \textbf{1997}, 489, 753; M. Ikeda, et al., \emph{ApJ}, \textbf{2001}, 560, 792; J. M. Lykke, et al., \emph{A\&A},\textbf{2017}, 597, A53.}$A small number of lines of trans-2,3-dideutero-oxirane had been previously analyzed in the microwave region$\footnote{C. Hirose, \emph{Bull. Chem. Soc. Jap.}, \textbf{1974}, 47, 1311.}$ up to 70 GHz. We have recently $\footnote{S. Albert, Z. Chen, K. Keppler, Ph. Lerch, M. Quack, V. Schurig, O. Trapp, \emph{Phys.Chem.Chem.Phys.}, \textbf{2019}, 21, 3669}$ measured and successfully analyzed the rotational spectrum of monodeutero-oxirane between 65 and 119 GHz using our GHz spectrometer $\footnote{M. Suter, M. Quack, \emph{Appl. Opt.}, \textbf{2015}, 54 (14), 4417; S. Albert, Z. Chen, C. Fabri, Ph. Lerch, R. Prentner, M. Quack, \emph{Mol. Phys.}, \textbf{2016}, 114, 2751.}$, and in the 0.75 to 2.5 THz range measured with our FTIR setup $\footnote{S. Albert, Ph. Lerch, M. Quack, \emph{ChemPhysChem}, \textbf{2013}, 14, 3204; S. Albert, K. K. Albert, Ph. Lerch, M. Quack, \emph{Faraday Discuss.}, \textbf{2011}, 150, 71.}$ at the Swiss Light Source.In the current work, we were able to assign and analyze more than 2500 rotational transitions of the vibronic ground state of trans-2,3-dideutero-oxirane up to J=65. The molecule is also of interest in the context of molecular parity violation, similar to the related molecule fluoro-oxirane $\footnote{H. Hollenstein, D. Luckhaus, J. Pochert, M. Quack, G. Seyfang, \emph{Angew. Chemie}, \textbf{1997}, 109 (1,2), 136; R. Berger, M. Quack, J. Stohner, \emph{Angew. Chem. Intl. Ed.}, \textbf{2001}, 40, 1667.}$. Our results are important in relation to isotopic chirality and parity violation$\footnote{M. Quack, \emph{Fundamental Symmetries and Symmetry Violations from High Resolution Spectroscopy}, in \emph{Handbook of High-resolution Spectroscopy}, M. Quack and F. Merkt eds. , Vol.1 , pp. 659-722 Wiley, Chichester \textbf{2011}}$, and to the possible astrophysical observation of this molecule. Issue Date: 22-Jun-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/107526 Date Available in IDEALS: 2020-06-26
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