This time will depend on two key factors : the precursor pressure, and the sticking probability.
2.
Where R is the rate of adsorption, S is the sticking probability, and F is the incident molar flux.
3.
If an adsorbate molecule enters the precursor state at a location that is remote from any other previously adsorbed adsorbate molecules, the sticking probability is reflected by the size of the S D constant.
4.
However, a key characteristic of ALD is the S will change with time, as more molecules have reacted with the surface this sticking probability will become smaller until reaching a value of zero once saturation is reached.
5.
In collaboration with Steve Bernasek, Giacinto has also studied the influence of vibrational excitation ( again for the first time in the first C-H overtone region ) on the sticking probability of a molecule ( methane ) on a metal surface [ 18 ].
6.
Thus the sticking probability ( s _ c ) is the P of sticking of the first site, plus the P of migrating from the first site " and then " sticking to the second site, plus the P of migrating from the second site " and then " sticking at the third site etc.
7.
If the adsorbate molecule in the precursor state is in close proximity to an adsorbate molecule that has already formed on the surface, it has a sticking probability reflected by the size of the S E constant and will either be adsorbed from the precursor state at a rate of k EC or will desorb into the gaseous phase at a rate of k ES.
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