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The adsorption of formic acid (HCOOH), acrylic acid (CH2= CHCO2H), propiolic acid (HC=CCO2H), and the corresponding alcohols on the Si(111)(7×7) surface have been investigated by NEXAFS. In each case, well-defined dipole transitions to σ* and π* molecular orbital s were observed above the C and 0 K-edges and used to probe the orientation and chemistry of these molecules on this silicon surface. Monolayer coverages of these molecules on silicon, bond strongly to the silicon surface via the carboxylic acid or alcohol group. In contrast, the C-C double and triple bonds of these molecules do not react initially with the silicon surface. Upon heating, however, the C-C double and triple bonds which are held in proximity to the surface by the carboxylic acid or alcohol group, are lost either by polymerization on the surface or reaction with the silicon substrate. These results illustrate the capabilities of NEXAFS to investigate molecular orientations on surfaces and the electronic structure of polyatomic adsorbates.
We report the results of photoelectron forward scattering studies of Co-Pt interfaces during the growth of epitaxial superlattices by MBE. These studies reveal that the interfaces are not atomically abrupt but exhibit limited interdiffusion. The dependence of magnetic anisotropy on growth axis and the strong 2-fold in-plane anisotropy for  oriented superlattices suggests that magnetocrystalline anisotropy is a major factor in determining the anisotropy in Co/Pt superlatticcs. The possibility that this anisotropy may arise from a combination of structural defects and local ordering is discussed.
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