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\documentclass[11pt]{article}

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\title{MICROWAVE SPECTRA OF THE CD$_3$OD and CH$_3$OD METHANOL ISOTOPOLOGS UP TO 1.1~THz AND THEIR SEARCH TOWARD IRAS 16293-2422}

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\author{\FirstName V. \LastName ILYUSHIN, \underline{\FirstName E. \LastName ALEKSEEV}, \FirstName R. \LastName POROHOVOI, \FirstName O. \LastName DOROVSKAYA} 
\address{Institute of Radio Astronomy of NASU, Mystetstv 4, 61002 Kharkiv, Ukraine}

\author{\underline{\FirstName H.~S.~P. \LastName M\"ULLER}, 
\FirstName F. \LastName LEWEN, \FirstName S. \LastName SCHLEMMER} 
\address{I.~Physikalisches Institut, Universit\"at zu K\"oln, 50937 K\"oln, Germany}

\author{\FirstName C. \LastName MAUL, \FirstName S. \LastName BAUERECKER} 
\address{Institut f\"ur Physikalische und Theoretische Chemie, Technische Universit\"at Braunschweig, Gau{\ss}str. 17, 38106 Braunschweig, Germany}

\author{\FirstName J.~K. \LastName J{\O}RGENSEN} 
\address{Niels Bohr Institute, University of Copenhagen, {\O}ster Voldgade 5-7, 1350 Copenhagen K, Denmark}

\author{\FirstName R. \LastName LEES} 
\address{Department of Physics, University of New Brunswick, Saint John, NB E2L 4L5, Canada}



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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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Different isotopic species of methanol have been detected in the warm parts of star-forming regions. 
We have started a program to investigate their rotational spectra to facilitate searches for these 
in space and here we present the results of our study of torsion-rotation spectra of the two deuterated isotopologs of methanol: \chem{CD_3OD} and \chem{CH_3OD}. The new microwave measurements were carried out using spectrometers in Kharkiv and K{\"o}ln (in total from 34 GHz up to 1.1 THz). The analysis is done using the rho axis method and the RAM36 program code. For both isotopologs the $v_{\rm t} = 2$  torsional state is significantly affected by intervibrational interactions with non-torsional vibrational modes which propagate down through intertorsional interactions. Thus we decided to concentrate our efforts on analysis of the $v_{\rm t} = 0, 1$  states at the moment. For both isotopologs we were able to get a fit within experimental error for $v_{\rm t} = 0, 1$ states and for both isotopologs we derived a line list for radio-astronomical observations. A search for \chem{CD_3OD} in data from the Protostellar Interferometric Line Survey (PILS) of IRAS 16293-2422 obtained with ALMA was performed. While we found several emission features that can be attributed largely to \chem{CD_3OD}, their number is as yet insufficient to establish a clear detection. For \chem{CH_3OD} the analysis of PILS observational data is in progress.   

The work in Cologne was supported by the Deutsche Forschungsgemeinschaft (DFG) via 
the collaborative research center SFB~956, project area B3, and through the Ger\"atezentrum 
``Cologne Center for Terahertz Spectroscopy''. The work in Kharkiv was supported by the 
Volkswagen Foundation. The assistance of the Science and Technology Center in the Ukraine is acknowledged (STCU
partner project P756). 

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