The effects of various ambients on the non-chopped and chopped films of cryolite, MgF2 and mixed cryolite-MgF2, as measured by ellipsometer, are reported. The moisture decreases the refractive index whereas an increase is observed in air and other ambients. In all the ambient-aging the chopped films show smaller changes (nearly half) in refractive index than non-chopped films. Aging seems to be due to three main processes, a long-term adsorption-like surface reaction and two short-term reactions.
Volume 96, 2022
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