Surface reconstruction induced geometries of Si clusters

We discuss a generalization of the surface reconstruction arguments for the structure of intermediate size Si clusters, which leads to model geometries for the sizes 33, 39 (two isomers), 45 (two isomers), 49 (two isomers), 57 and 61 (two isomers). The common feature in all these models is a structure that closely resembles the most stable reconstruction of Si surfaces, surrounding a core of bulk-like tetrahedrally bonded atoms. We investigate the energetics and the electronic structure of these models through first-principles density functional theory calculations. These models may be useful in understanding experimental results on the reactivity of Si clusters and their shape as inferred from mobility measurements.Comment: 9 figures (available from the author upon request) Submitted to Phys. Rev.

Energy dependence of collision characteristics in molecule-surface collisions

This article does not have an abstract

Fractals and resonances in collinear (He,H<SUP>+</SUP><SUB>2</SUB>) collisions

Oscillations in the chattering region in plots of final action and collision time as a function of the initial vibrational phase of the diatom in collinear He+H<SUP>+</SUP><SUB>2</SUB>(n<SUB>i</SUB>=0) collisions are shown to have characteristics of fractals with a capacity dimension 1.38-1.68 over a wide range of translational energies. For energies above the reaction threshold, the fractal zones are shown to occur between reactive and nonreactive bands and are related to known quantal reactive scattering resonances

Causes of fever in cancer patients (prospective study over 477 episodes)

The aim of this study was to determine the causes of fever among cancer patients.SCOPUS: ar.jinfo:eu-repo/semantics/publishe