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 Title: Vibrational Averaging Of The Isotropic Hyperfine Coupling Constants For The Methyl Radical Author(s): Adam, Ahmad Contributor(s): Yurchenko, Sergei N.; Yachmenev, Andrey; Jensen, Per Subject(s): Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA Abstract: Electronic contributions to molecular properties are often considered as the major factor and usually reported in the literature without ro-vibrational corrections. However, there are many cases where the nuclear motion contributions are significant and even larger than the electronic contribution. In order to obtain accurate theoretical predictions, nuclear motion effects on molecular properties need to be taken into account. The computed isotropic hyperfine coupling constants for the nonvibrating methyl radical CH$_3$ are far from the experimental values. For CH$_3$, we have calculated the vibrational-state-dependence of the isotropic hyperfine coupling constant in the electronic ground state. The vibrational wavefunctions used in the averaging procedure were obtained variationally with the TROVE program. Analytical representations for the potential energy surfaces and the hyperfine coupling constant surfaces are obtained in least-squares fitting procedures. Thermal averaging has been carried out for molecules in thermal equilibrium, i.e., with Boltzmann-distributed populations. The calculation methods and the results will be discussed in detail. Issue Date: 2014-06-20 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Adam, A.; Yurchenko, S.N.; Yachmenev, A.; Jensen, P. VIBRATIONAL AVERAGING OF THE ISOTROPIC HYPERFINE COUPLING CONSTANTS FOR THE METHYL RADICAL. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.FA05 Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/50806 DOI: https://doi.org/10.15278/isms.2014.FA05 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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