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Soft-Landings, Hard Rebounds, and Fracture of Alkali-Halide Nanocrystals

Published online by Cambridge University Press:  28 February 2011

Rainer D. Beck ,
Pamela St. John ,
Margie L. Homer  and
Robert L. Whetten
Rainer D. Beck
Affiliation:
Departments of Chemistry, University of California, Los Angeles, CA 90024-1569
Pamela St. John
Affiliation:
Departments of Chemistry, University of California, Los Angeles, CA 90024-1569
Margie L. Homer
Affiliation:
Departments of Chemistry, University of California, Los Angeles, CA 90024-1569
Robert L. Whetten
Affiliation:
Departments of Chemistry, University of California, Los Angeles, CA 90024-1569
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Abstract:

Collision phenomena involving the smallest solid objects and inert solid surfaces have been explored by the method of mass-selective time-of-flight and angular measurements of the surface-collision dynamics of ionized cluster beams. At lowest energy, both transient physisorption (soft-landing) and intact scattering have been observed. Impact of nanocrystalline sodium-fluoride clusters (NanFn-1+) against graphite at intermediate energy (0.2 - 1 eV per atom) leads efficiently to fracture-like processes. At higher energy, a featureless evaporative cascade dominates the fragment distribution. Energy- and angle-resolved scattering of mass-selected clusters from oriented graphite is shown to be a versatile method for investigation of cluster structure-energetics, cluster-surface interactions, and sticking phenomena.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 206: Symposium G – Clusters and Cluster-Assembled Materials , 1990 , 341
Copyright
Copyright © Materials Research Society 1991

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References

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