β Scribed by M. Fanetti; L. Gavioli; M. Sancrotti
No coin nor oath required. For personal study only.
Tailoring long-range ordered nanostructured systems is a fundamental issue in many fields of science, ranging from materials science (e.g., nanodot arrays, nanowires, nanostripes, or functionalized nanogrids ) to biology (as benchmarks and substrates for biological systems ). Nanoscale regular patterning over macroscopic areas is not feasible by manipulation of single atoms or molecules, however the task could be achieved by employing a self-assembling process in which the formation of structures is driven by internal interactions (e.g., Coulomb forces). A promising way to obtain nanopatterns is based on the surface faceting of metallic substrates induced by adsorbed species. In this process, the interaction between adsorbates and substrate drives the formation of substrate domains (facets), in which the crystallographic orientation is different from the original surface. It is known that organic molecules adsorbed on metallic surfaces can show self-organization properties, giving rise to ordered monolayers under appropriate conditions. Furthermore, in some cases the adsorption of organic molecules has been reported to induce faceting of the substrate accompanied by a local ordering of the adsorbates, as for benzoate on Cu(110), amino acids on Cu(001), or p-aminobenzoic acid on Cu(110). In these cases, substrate faceting takes place but no long-range order has been observed in the obtained films. Moreover, the size of the facets is in the range of tens of nanometers and not homogeneously distributed on the surface. Therefore, the realization of long-range ordered molecular nanopatterns is still an open problem. Crucial factors determining the energetically favored structural configuration of the system are: the interaction between COMMUNICATION
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A chemisorbed layer prepared by exposing a clean Cu(110) surface to acetic acid, CHBCOOH, at room temperature was / studied by LEED and X-ray photoelectron diffraction (XPD). LEED shows a well ordered pattern with an oblique / 41 1 4) / unit cell. The equivalent oxygen coverage is 0.75 corresponding
A method for estimating the long range dipole moment coefkient. D?, for two colliding dissimilar S-state atoms from their ground rmte sum rule values is presented and applied to systems involving H, He and Ne.
The magnetic properties of orthorhombic LiMnO 2 have been investigated in detail for the first time. The susceptibility data show several features including a Curie-Weiss regime from 600 to 800 K with p β«Ψβ¬ Ψ1056(13) K and eff β«Ψβ¬ 4.82 B /Mn 3Ψ , a broad maximum at 360 K, and a field-cooled (FC), ze