Understanding the surface potential of water

SM Kathmann, IFW Kuo, CJ Mundy… - The Journal of Physical …, 2011 - ACS Publications
SM Kathmann, IFW Kuo, CJ Mundy, GK Schenter
The Journal of Physical Chemistry B, 2011ACS Publications
We have resolved the inconsistency in quantifying the surface potential at the liquid− vapor
interface when using explicit ab initio electronic charge density and effective atomic partial
charge models of liquid water. This is related, in part, to the fact that the resulting electric
potentials from partial-charge models and ab initio charge distributions are quite different
except for those regions of space between the molecules. We show that the electrostatic
surface potential from a quantum mechanical charge distribution compares well to high …
We have resolved the inconsistency in quantifying the surface potential at the liquid−vapor interface when using explicit ab initio electronic charge density and effective atomic partial charge models of liquid water. This is related, in part, to the fact that the resulting electric potentials from partial-charge models and ab initio charge distributions are quite different except for those regions of space between the molecules. We show that the electrostatic surface potential from a quantum mechanical charge distribution compares well to high-energy electron diffraction and electron holography measurements, as opposed to the comparison with electrochemical measurements. We suggest that certain regions of space be excluded when comparing computed surface potentials with electrochemical measurements. This work describes a novel interpretation of ab initio computed surface potentials through high-energy electron holography measurements as useful benchmarks toward a better understanding of electrochemistry.
ACS Publications
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