inner Helmholtz plane (IHP)

https://doi.org/10.1351/goldbook.I03048
The locus of the electrical centres of specifically adsorbed ions.
See also:
outer Helmholtz plane
Sources:
PAC, 1986, 58, 437. (Interphases in systems of conducting phases (Recommendations 1985)) on page 448 [Terms] [Paper]
PAC, 1991, 63, 895. (Nomenclature, symbols, definitions and measurements for electrified interfaces in aqueous dispersions of solids (Recommendations 1991)) on page 899 [Terms] [Paper]