The sticking coefficient is a dimensionless number used in surface science and physical chemistry to describe the likelihood of an atom, ion, or molecule colliding with a surface and sticking to it rather than bouncing off. It quantifies the fraction of incidents where an incoming particle adheres to a surface upon collision.
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The probability that an impinging species is retained at a surface under specified conditions. Incident flux alone does not fix net surface accumulation when sticking is incomplete or desorption occurs.