On Dipole Moments and Hydrogen Bond Identification in Water Clusters

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Abstract

It is demonstrated that the localized orbitals calculated for a water cluster have small delocalization tails along the hydrogen bonds, that are crucial in determining the resulting dipole moments of the system. (By cutting them, one gets much smaller dipole moments for the individual monomers - close to the values one obtains by using a Bader-type analysis.) This means that the individual water monomers can be delimited only in a quite fuzzy manner, and the electronic charge density in a given point cannot be assigned completely to that or another molecule. Thus, one arrives to the brink of breaking the concept of a water cluster consisting of individual molecules. The analysis of the tails of the localized orbitals can also be used to identify the pairs of water molecules actually forming hydrogen bonds.

Original languageEnglish
Pages (from-to)4408-4417
Number of pages10
JournalJournal of Physical Chemistry A
Volume120
Issue number25
DOIs
Publication statusPublished - Jun 30 2016

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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