Affiliation:
1. Max-Planck-Institut für Strömungsforschung, D-37073 Göttingen, Germany
Abstract
In a crossed molecular beam arrangement helium atoms are scattered from argon, ammonia, and water clusters which are generated in the size range of n=25 to 4600 by adiabatic expansion through conical nozzles. The inelastic energy transfer is detected by time-of-flight analysis of the scattered helium atoms with a resolution of better than 1 meV. For Ar the peak of the transferred energy is interpreted as compressional mode of a dense solid sphere. The positions of the maximum decrease as a function of the increasing average cluster size and converge to the value of the surface phonons of solid argon. The molecular clusters behave differently; the excitation of librational modes and of more than one peak in the transferred energy are observed.
Publisher
World Scientific Pub Co Pte Lt
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces,Condensed Matter Physics
Cited by
8 articles.
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