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 Title: THE ROTATIONAL SPECTRUM AND POTENTIAL ENERGY SURFACE OF AR-SIO: AN EXPERIMENTAL INVESTIGATION Author(s): McCarthy, Michael C. Contributor(s): Dawes, Richard Subject(s): Comparing theory and experiment Abstract: The rotational spectra of five isotopic species of the Ar--SiO complex have been observed at high-spectral resolution between 8 and 18\,GHz using chirped Fourier transform microwave spectroscopy and a discharge nozzle source; follow-up cavity measurements have extended these measurements to as high as 35\,GHz. The spectra of the normal species is dominated by a strong progression of $a$-type rotational transitions arising from increasing quanta in the Si--O stretch. A rotational analysis of these lines and a hyperfine analysis of Ar--Si$^{17}$O suggest that the complex is a highly fluxional prolate symmetric rotor with a vibrationally-averaged structure close to T-shaped in which the oxygen atom lies closer to argon than the silicon atom, much like Ar--CO. Newly performed calculations of the rovibrational level pattern are in good agreement with the experimentally-derived rotational constants of normal and isotopic Ar--SiO up to $v$=12 ($\sim$14,500\,cm$^{-1}$) in the Si--O stretch\, suggesting that the present theoretical treatment well reproduces the salient properties of the intramolecular potential. Issue Date: 06/22/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100536 DOI: 10.15278/isms.2018.FC01 Other Identifier(s): FC01 Date Available in IDEALS: 2018-08-172018-12-12
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