ROTATIONAL SPECTROSCOPY OF HD$^{18}$O

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The recent detection of HD$^{18}$O in Orion KL nderline{\textbf{521}}, (L20), 2010.} by the \emph{Herschel Space Observatory} provided a strong motivation to revisit the rotational spectrum in order to obtain more accurate calculations of transition frequencies. Rotational ransitions were recorded in the $300-2700$~GHz frequency range. Analysis of the combined microwave and infrared data sets with an Euler series Hamiltonian nderline{\textbf{233}} (174), 2005.} has facilitated determination of a set of precise rotational constants to support precision velocity measurements. The new rotational data also provides a means of evaluating the performance of the MARVEL algorithm used in the recent review of all available HDO data nderline{\textbf{111}}(2160), 2010.}.

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Author Institution: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109

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