Oxidation of (011) Iron at Room Temperature: Mainly LEED Aspects

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Abstract
The interaction of oxygen with (011) Fe at room temperature has been investigated using simultaneous combinations of LEED, ellipsometry, and surface potential measurements. This paper is concerned mainly with the LEED aspects. The sequence of LEED patterns found was either similar to that previously found or slightly different, depending on experimental conditions. In most experiments a new LEED pattern, p(2×1), was observed instead of the c(3×1) pattern previously reported. Direct keying of the LEED patterns to the ellipsometry-derived growth kinetics leads to further understanding of the oxidation mechanism. The occurrence of heterogeneous oxide nucleation is supported, and it is shown that an oxide consistent with the expected diffraction properties of FeO grows to a “limiting” thickness of about 25–30 Å in oxygen. The terminal oxide in the air is concluded to have about the same thickness but a significantly different structure.

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