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During the last decade there has been an increasing interest in
clusters and small particles because of the peculiar proper ties
induced by their large area to volume ratio. For that reason small
particles are often considered as an intermediate state of matter
at the border between atomic (or molecular) chemistry, and physics
of the condensed matter. The importance of the surface effect can
explain the anomalous properties, for example the exis tence of the
five fold symmetry observed in different circumstan ces '(beams of
rare gas clusters, gold particles deposited on a substrate).
However the question of the critical size at which the transition
to bulk properties occurs cannot be simply answered, since the
reply depends on the peculiar property which is studied. The
importance of the size effect was emphasized in the last
International Meetings. However the situation remains confused in
most cases since the exact role of the cluster environment cannot
be clearly elucidated and is a main difficulty, except in cluster
beam experiments. In fact ideally free clusters constitute a labo
ratory exception. In most applications small particles must be
supported on a surface or embedded in a matrix, in order to be
stabilized, which obviously shows the role of the environment."
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