Studies of Free Clusters and of Low Energy Cluster Beam Deposition at TASC

author: Monica de Simone, Laboratorio Nazionale TASC
published: Feb. 12, 2008,   recorded: October 2007,   views: 175

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Description

The understanding of the interplay between size and properties is a necessary step towards the production of tailored cluster-assembled materials. With the aim of investigating functional properties of clusters, their size-dependent geometry and electronic structure, and the correlations with nanoassembled materials obtained by cluster deposition, TASC recently acquired a new UHV-Compatible Roaming Supersonic Cluster Source. The procesess of cluster production is based on the pulsed microsputtering, localised on the surface of a rotating rod (PMCS). The material must be a conductor one or a semiconductor heated to the conductive temperature. This apparatus is conceived as a facility able to be coupled to a variety of UHV compatible systems located at TASC-INFM (both in-house apparatus and syncrotron radiation beam lines at ELETTRA). Here we presents some of our first results we obtained within a collaboration with the prof. P. Milani’s group. In the first class of experiment we concentrated our efforts on the study of inner shell absorption spectroscopy both on free clusters. The experiments have been carried out at the Gas Phase beamline, and for the first time it was possible to obtain a complete set of Near Edge X-ray Absorption Fine Structure spectra on free transition metal clusters (Ti L-edge for Ti clusters with size comprised between 15 and 1000 atoms/cluster). Within the field of material science, our first measurements were dedicated to the study of oxidation dynamics of nanostructured titanium films performed at the Analytical Division Laboratory at TASC

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