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 Title: Chirped-pulse Fourier-transform Microwave Spectroscopy Of The Prototypical C-h…π Interaction: The Benzene…acetylene Weakly Bound Dimer Author(s): Peebles, Rebecca A. Contributor(s): Pate, Brooks; Peebles, Sean A.; Dorris, Rachel E.; Seifert, Nathan A.; Ulrich, Nathan Subject(s): Chirped pulse Abstract: The rotational spectrum of the CH$\cdots\pi$ bonded complex between benzene and acetylene has been measured in the $6-20$ GHz range using chirped-pulse Fourier-transform microwave spectroscopy. The spectra for the normal isotopologue, three unique $^{13}$C substituted species, and the $d_1$-benzene$\cdots$HCCH species have allowed determination of the dimer structure. The spectrum is that of a symmetric top, with effective $C_{6v}$ symmetry, and a CH$\cdots\pi$ distance of $2.4921(1)$ \AA. The dipole moment has been measured using the Stark effect, and is $0.438(11)$ D. In addition to the ground state spectrum, three additional sets of transitions corresponding to similar rotational constants have been observed, likely due to excitation of the three low energy intermolecular vibrational modes of the dimer. Analysis of these excited state transitions is in progress. Comparison of the binding energy and structure of the benzene$\cdots$HCCH dimer with other H$\cdots\pi$ complexes will be presented. Issue Date: 2014-06-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Peebles, R.A.; Pate, B.; Peebles, S.A.; Dorris, R.E.; Seifert, N.A.; Ulrich, N. CHIRPED-PULSE FOURIER-TRANSFORM MICROWAVE SPECTROSCOPY OF THE PROTOTYPICAL C-H…π INTERACTION: THE BENZENE…ACETYLENE WEAKLY BOUND DIMER. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FD08 Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/51120 DOI: https://doi.org/10.15278/isms.2014.FD08 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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