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He-ATOM SCATTERING AS A PROBE OF CLUSTER VIBRATIONAL DYNAMICS

Author

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  • UDO BUCK

    (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 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.

Suggested Citation

  • Udo Buck, 1996. "He-ATOM SCATTERING AS A PROBE OF CLUSTER VIBRATIONAL DYNAMICS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(01), pages 467-473.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:01:n:s0218625x9600084x
    DOI: 10.1142/S0218625X9600084X
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