# DOPPLER LIMITED SPECTROSCOPY OF THE ${^{r}}Q_{2}$-BRANCH OF HSOH AT 935 GHz

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 Title: DOPPLER LIMITED SPECTROSCOPY OF THE ${^{r}}Q_{2}$-BRANCH OF HSOH AT 935 GHz Creators: Thorwirth, Sven; Winnewisser, G.; Lewen, Frank; Müller, Holger S. P.; Behnke, Markus; Hahn, Josef; Gauss, Jürgen Issue Date: 2002 Publisher: Ohio State University Abstract: Hydrogenthioperoxide or Oxadisulfane, HSOH, has been uniquely characterized by its recorded millimeter wave spectrum to be a nonplanar molecule with a structure analogous to the two parent'' molecules HSSH and HOOH. Because of their near right-angle chain structures, HSOH and the isotopically substituted forms are nearly accidental symmetric tops, but they possess dipole moments essentially perpendicular to the pseudo-symmetry axis. In the case of HSOH, two perpendicular dipole moment components exist, pointing in the direction of the b- and c-axis. This leads to rotational spectra consisting of compact Q-branches and regular, in principle easily discernable P- and R- branches. P-, Q- and R- branches form bandheads in dependence of the quantum number J. For HSOH we have scanned the frequency region of the expected band centers of $K_{a} = 1 - 0, 2 - 1, 3 - 2$ which occur at frequencies covering the entire frequency region of the Cologne Terahertz spectrometer. These band centers are located at 187 GHz, 561 GHz, and 935 GHz for the ${^{r}}Q_{0}$-, and ${^{r}}Q_{2}$-branches, respectively. We will give a demonstration of the complexity of the ${^{r}}Q_{2}$-branch at 935 GHz and will present the assignment. The derived preliminary rotational constants are: $A = 202069 GHz, B = 15282 GHz$, and $C = 14840 GHz$. Description: Author Institution: I. Physikalisches Institut, Universit\""{a}t zu K\""{o}ln; Deparment of Physics, The Ohio State University; Institut f\""{u}r Anorganische Chemie, Universit\""{a}t zu K\""{o}ln; Institut f\""{u}r Physikalische Chemie, Johannes-Gutenberg-Universit\""{a}t Mainz URI: http://hdl.handle.net/1811/20661 Other Identifiers: 2002-TJ-13