He-ATOM SCATTERING AS A PROBE OF CLUSTER VIBRATIONAL DYNAMICS

Udo Buck
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Udo Buck: Max-Planck-Institut für Strömungsforschung, D-37073 Göttingen, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 467-473

Abstract: In a crossed molecular beam arrangement helium atoms are scattered from argon, ammonia, and water clusters which are generated in the size range ofn=25to 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.

Date: 1996
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DOI: 10.1142/S0218625X9600084X

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