Intrafilm and interface interaction determination by inelastic helium atom scattering

Organ pipe modes have recently been measured by the inelastic helium atom scattering (HAS) technique for epitaxial films (2–20 monolayers) of sodium on Cu(001). For the Kr/Ag(111), Ar/Ag(111), and KBr/NaCl(001) multilayer systems measured previously by HAS the phonon frequencies as a function of the...

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Bibliographic Details
Published in:Journal of electron spectroscopy and related phenomena 1993-12, Vol.64, p.755-762
Main Authors: Luo, N.S., Ruggerone, P., Toennies, J.P., Benedek, G., Celli, V.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Dynamics
vibrations
Exact sciences and technology
Physics
Solid-fluid interfaces
Surface and interface dynamics and vibrations
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:Organ pipe modes have recently been measured by the inelastic helium atom scattering (HAS) technique for epitaxial films (2–20 monolayers) of sodium on Cu(001). For the Kr/Ag(111), Ar/Ag(111), and KBr/NaCl(001) multilayer systems measured previously by HAS the phonon frequencies as a function of the number of monolayers do not follow the organ pipe sequence. Within the framework of a force constant model the interface condition for the organ pipe modes is derived, and we find that the vibrational frequency distribution in the case of epitaxial thin films depends not only on the intrafilm interaction but also strongly on the interface interaction. The theory provides a consistent explanation of the above phenomena observed by helium atom scattering.
ISSN:0368-2048
1873-2526
DOI:10.1016/0368-2048(93)80146-D