# MICROWAVE SPECTRUM AND STRUCTURE OF $H_{2}O-SO_{3}$

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 Title: MICROWAVE SPECTRUM AND STRUCTURE OF $H_{2}O-SO_{3}$ Creators: Phillips, J. A.; Canagaratna, M.; Goodfriend, H.; Leopold, K. R. Issue Date: 1995 Publisher: Ohio State University Abstract: The microwave spectrum of $H_{2}O-SO_{3}$ and five of its isotopically substituted derivatives have been observed by pulsed-nozzle Fourier transform microwave spectroscopy. The complex, which is an important intermediate in the formation of atmospheric $H_{2}SO_{4}$, has a structure in which the oxygen of the water approaches the sulfur of the $SO_{3}$ above its plane, reminiscent of a donor-acceptor complex. Analysis of the K = 0 rigid rotor spectrum gives an intermolecular S-O bond legth of $2,432(3) \AA$ and an out-of-plane distortion of the $SO_{3}$ of $2-3^{\circ}$. The $C_{2}$ axis of the water forms an angle of $103(2)^{\circ}$ with the intermolecular bond. Although the intermolecular torsional angle is not determined, this structure places the protons $2.67 \AA$ from the $SO_{3}$ oxygens in a staggered conformation, indicating that even in the complex are also observed, and progress in their analysis will be discussed. The success of these experiments depended criticially on the use of a molecular source in which liquid water is was evaportaed directly into the supersonic expansion. Such a source whould be general for liquids of moderate vapor pressure, and its design is described. Description: Author Institution: University of Minnesota, Minneapolis, MN 55455 URI: http://hdl.handle.net/1811/29748 Other Identifiers: 1995-TB-06