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 Title: Geometry of an isolated dimer of imidazole characterised by rotational spectroscopy and ab initio calculations Author(s): Mullaney, John C. Contributor(s): Legon, Anthony; Walker, Nick; Tew, David Peter; Zaleski, Daniel P. Subject(s): Chirped pulse Abstract: An isolated, gas-phase dimer of imidazole is generated through laser vaporisation of a solid rod containing a 1:1 mixture of imidazole and copper in the presence of an argon buffer gas undergoing supersonic expansion. The complex is characterised through broadband rotational spectroscopy and is shown to have a twisted, hydrogen-bonded geometry. Calculations at the CCSD(T)(F12)/cc-pVDZ-F12 level of theory confirm this to be the lowest-energy conformer of the imidazole dimer. The distance between the respective centres of mass of the imidazole monomer subunits is determined to be 5.2751(1) \AA, and the twist angle $\gamma$ describing rotation of one monomer with respect to the other about a line connecting the centres of mass of the monomers is determined to be 87.9(4)$^{o}$. Four out of six intermolecular parameters in the model geometry are precisely determined from the experimental rotational constants and are consistent with results calculated ab initio. Issue Date: 2016-06-22 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper/Presentation Type: Text Language: En URI: http://hdl.handle.net/2142/91259 Rights Information: Copyright 2016 by the authors Date Available in IDEALS: 2016-08-22
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