outer Helmholtz plane (OHP)

https://doi.org/10.1351/goldbook.O04350
At an electrified @[email protected], the locus of the electrical centres of non-specifically adsorbed ions in their position of closest approach.
Source:
PAC, 1991, 63, 895. (Nomenclature, symbols, definitions and measurements for electrified interfaces in aqueous dispersions of solids (Recommendations 1991)) on page 900 [Terms] [Paper]