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Missing-Row Surface Structure on Body-Centered-Cubic (211):Fe(211)2 X 1-O

机译:以体心为中心的缺失行表面结构(211):Fe(211)2 X 1-O

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A basic problem in the study of solid crystal surfaces is the determination of their atomic structure, i.e. the determination of the positions of all atoms in the unit cell of the outermost layers of a crystal. Several surface sensitive techniques have been developed for this purpose, the oldest and most productive being low energy electron diffraction (LEED). The LEED technique is formally similar to X ray diffraction, insofar as it is based on a comparison between observed and calculated intensities of diffracted beams, but differs from X ray diffraction in several experimental and theoretical aspects, the most important being the failure of the kinematic (single scattering) theory and the need for a dynamical (multiple-scattering) treatment of diffraction. LEED is credited with the discovery of the phenomena of relaxation and reconstruction. We report here the results of a LEED analysis of the FE(211) -0(2x1) surface which permits a detailed comparison of the structure of the oxygen covered surface with that of the clean surface, and provides an example of surface reconstruction driven by an adsorbate. The reconstruction involves a missing row of substrate atoms and is the first such reconstruction identified on b.c.c. surfaces. Reprints, Ion. (MJM)

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