During the thin film NEG getter activation, why the passivation layer’s molecules are diffused into the film instead evaporated, extracted or departed from the surface? Why is the diffusion happening ?
NEG stands for Not Evaporable Getter! The energy needed to evaporate the NEG
material is much higher than the diffusion energy.
Diffusion is "almost always" present: the diffusion velocity is related to the activation energy of the process and the temperature (higher temperatures or lower the activation energy, higher the diffusion velocity).
Yes, NEG stands for Not Evaporable Getter but I mean the passivation layer that consist of oxides, carbids etch occured naturally not the whole getter. Why this passivation layer gets into the film instead of departs from the surface?
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