Issue 3, 2020

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, the 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.

Graphical abstract: Quantum tunnelling pathways of the water pentamer

Article information

Article type
Paper
Submitted
11 oct. 2019
Accepted
30 nov. 2019
First published
02 dic. 2019

Phys. Chem. Chem. Phys., 2020,22, 1035-1044

Quantum tunnelling pathways of the water pentamer

M. T. Cvitaš and J. O. Richardson, Phys. Chem. Chem. Phys., 2020, 22, 1035 DOI: 10.1039/C9CP05561D

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