coverage (rus. покрытие поверхности адсорбатом) — a fraction of the adsorption sites on the surface of a solid occupied by the adsorbate (adsorbed substance).


Adsorbate surface coverage shows the percentage of the surface of a solid occupied by adsorbed objects (atoms or molecules) and can also be viewed as a quantitative description of adsorption and show the specific amount of material transferred in the process of adsorption from the gas (liquid) phase to the surface of the solid phase.

Adsorbate surface coverage is expressed in terms of fractions of a monolayer *) as the number of adsorbed objects per unit area (units/m2), or the number of adsorbated objects divided by the number of atoms in the surface layer of solids (adsorbated units / surface units). 

*) The monolayer is the most dense layer of an adsorbate with a thickness of one atom (or molecule). The amount of adsorbate in the monolayer depends on the material on which adsorption takes place and the nature of the adsorbate. In the case of adsorption on regular crystallographic surfaces, one monolayer corresponds to the concentration at which each unit cell of 1 × 1 ideal unreconstructed substrate surface has adsorbed one atom (or molecule).


  • Zotov Andrey V.
  • Saranin Alexander A.


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