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The sticking probability is the probability that molecules are trapped on surfaces and adsorb chemically. From Langmuir's adsorption isotherm, molecules cannot adsorb on surfaces when the adsorption sites are already occupied by other molecules, so the sticking probability can be expressed as follows:
Additional recommended knowledge
where s0 is the initial sticking probability and c is the coverage.
Similarly, when molecules adsorb on surfaces dissociatively, the sticking probability is
Although these equations are simple and can be easily understood, they cannot explain experimental results. Their simple explanation is not enough.
In 1958, P. Kisliuk presented an equation that can explain experimental results. In his theory, molecules are trapped in precursor states (physisorption) before chemisorption. Then the molecules meet adsorption sites that molecules can adsorb to chemically, so the molecules behave as follows.
If these sites are not occupied, molecules
and if these sites are occupied, they
Then the sticking probability is
When K=1, this equation equals Langmuir's adsorption isotherm.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sticking_probability". A list of authors is available in Wikipedia.|