Transformation of iridium(110) (1×1) into (1×2) and spatial distribution of reactive carbon dioxide desorption

概要

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The spatial distribution of the desorption flux of CO2 produced on Ir(110) (1x1) and (1x2) surfaces was studied by means of angle-resolved thermal desorption and low-energy electron diffraction. The distribution is collimated along the bulk surface normal on (1x1). It is sharp in the [001] direction and sharper in the [11-bar 0] direction. This distribution is consistent with the model that the reactive desorption occurs on a short bridge site. On (1x2) surfaces, two-directional desorption was observed, which was collimated along the axis at the polar angle of 26 deg in both [001] and [001-bar] directions. The distribution in the [11-bar 0] direction is collimated along the bulk surface normal. The reactive desorption was suggested to take place on a threefold hollow site on the declining terrace. The spatial distribution changed from the (1x1) type to the (1x2) type during the transformation of the surface structure. This structure change was confirmed by low-energy electron diffraction.
American Institute of Physicsの論文
1991-01-01