Abstract
Measurements utilizing polarized light were made of the increase in film thickness with time on {100}, {110}, {111}, and {311} surfaces of a copper single crystal immersed in water in equilibrium with atmospheres containing either oxygen or oxygen‐helium mixtures containing 1, 10, or 20% oxygen. With the oxygen atmosphere a film rapidly reached a limiting thickness that remained constant for 1.5 to 2 hr after which time the formation of was observed. Stirring increased the time required to observe the formation of . Similar behavior was observed for 10% and 20percnt; oxygen atmospheres; the limiting film thickness of and the time required to observe the formation of increased with decreasing oxygen content in the atmosphere. When a 1% oxygen atmosphere was used, parabolic film growth was observed. In all cases the {111} plane exhibited the lowest growth rate.
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