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Quantum tunnelling pathways of the water pentamer

Abstract

We apply the semiclassical instanton method to calculate all feasible tunnelling pathways in the water pentamer. Similarly to the water trimer, there are labile flip dynamics as well as a number of different bifurcation pathways coupled to flips. In contrast to the trimer, puckering motion of the oxygen ring makes the ring-polymer instanton approach difficult to converge, a problem which is resolved by using a recently developed time-independent formalism of the method. We use the results to predict the complete ground-state tunnelling splitting pattern of 320 states, which should help in the continuing effort to assign the experimental spectrum. A comparison between the rearrangement pathways in the water trimer and pentamer sheds light on the many-body cooperative effects of hydrogen bonding which are important for a full understanding of the liquid state.

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Publication details

The article was received on 11 Oct 2019, accepted on 30 Nov 2019 and first published on 02 Dec 2019


Article type: Paper
DOI: 10.1039/C9CP05561D
Phys. Chem. Chem. Phys., 2019, Accepted Manuscript

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    Quantum tunnelling pathways of the water pentamer

    M. T. Cvitaš and J. O. Richardson, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C9CP05561D

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