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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:2018-08-17
2018-12-12


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