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Abstract

We have performed studies of the formation and evolution of
samples of Im-Helium, (Im=Ne, D-2, N-2) solids obtained by
allowing a mixed beam of helium and impurity molecules to fall
onto the surface of superfluid helium. Clusters consisting of
single impurity molecules and/or small aggregates of the
molecules surrounded by layers of solid helium agglomerate to
form porous solids. These solids have been studied by x-ray
diffraction techniques. As the solids were heated above their
formation temperature of T=1.5 K, the small aggregates or
clusters of impurities tended to form larger clusters, which x-
ray diffraction revealed to be nanocrystallites ranging in size
from 3 to 6 nm.