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 Title: New Measurements And Assignments In The Vt = 0, 1, 2 Torsional States Of cd3oh And ch3< Author(s): Ilyushin, V. Contributor(s): Xu, Li-Hong; Lees, Ronald M.; Berezkin, K.; Maul, Christof; Bauerecker, Sigurd; Schlemmer, Stephan; Lewen, Frank; Müller, Holger S.P.; Dorovskaya, Olga; Alekseev, E. A.; Bakhmat, Yan Subject(s): Mini-symposium: Large Amplitude Motions Abstract: We present\footnote{This work was done under support of the Deutsche Forschungsgemeinschaft and Volkswagen foundation. The assistance of Science and Technology Center in Ukraine is acknowledged (STCU partner project P756).} the results of our new study of the torsion-rotation spectra of the two deuterated isotopologues of methanol: \chem{CD_3OH} and \chem{CH_3OD}. The new microwave measurements were carried out from the millimeter wave range (starting at 34 GHz) to the THz range (up to 1.1 THz) using spectrometers in Kharkiv and K{\"o}ln. The new measurements in the FIR range were carried out in Braunschweig for \chem{CD_3OH} from 20 to 900 \wn. In this work we significantly extend the rotational quantum number coverage for both isotopologues (from $J_{up}$ = 26 [1] to $J_{up}$ = 55 for \chem{CD_3OH} and from $J_{up}$ =21 [2] to $J_{up}$ =40 for \chem{CH_3OD}). The analysis is done using the rho axis method and the RAM36 program code. Our preliminary fits show that for both isotopologs the v$_t$ = 2 torsional state is significantly affected by intervibrational interactions with non-torsional vibrational modes which propagate down through intertorsional interactions. At the same time, for \chem{CD_3OH} we were able to get a fit within experimental error for v$_t$ = 0, 1 states. For \chem{CH_3OD} analysis is in progress now. In the talk the details of this new study will be discussed. [1] A. Predoi-Cross, Li-Hong Xu, M.S. Walsh, R.M. Lees, M. Winnewisser, and H. Lichau J. Mol. Spectrosc.188, 94–101 (1998). [2] Y.-B. Duan, I. Ozier, S. Tsunekawa, and K. Takagi, J. Mol. Spectrosc. 218 (2003) 95–107. Issue Date: 2021-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/111234 Date Available in IDEALS: 2021-09-24
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