Abstract
This article describes the relationship of the Molecular Symmetry (MS) group of Longuet-Higgins and, ultimately, the Complete Nuclear Permutation-Inversion (CNPI) group to a molecular potential energy surface. The characterization of energy levels when“structural degeneracies”are lifted by finite tunnelling probabilities is outlined. Cosets of the MS group are used to obtain limiting numbers for the occurrence of structures of a given symmetry. It is shown how the conservation of point group symmetry elements along steepest descent pathways across the potential energy surface provides a useful framework for understanding isomerization. These ideas lead us to a generalization of the MS group to cases where a molecule samples more than one distinct structural form on the timescale of spectroscopic resolution. Tunnelling probabilities under these conditions are discussed and the circumstances under which the MS group could adequately describe“asymmetric”interconversions are explored. A number of simple examples is presented.
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Bone, R.G.A. (1995). Generalizing the Molecular Symmetry Group of Longuet-Higgins to Asymmetric Tunnelling Problems. In: Smeyers, Y.G. (eds) Structure and Dynamics of Non-Rigid Molecular Systems. Topics in Molecular Organization and Engineering, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1066-2_3
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DOI: https://doi.org/10.1007/978-94-011-1066-2_3
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