IDEAS home Printed from https://ideas.repec.org/a/wsi/srlxxx/v01y1994i04ns0218625x94000837.html
   My bibliography  Save this article

Dipole Activity And Polarisation Of Surface Phonons In Thin Ionic Films

Author

Listed:
  • M.B. LEE

    (IRC Surface Science, Univ. of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK)

  • B.G. FREDERICK

    (IRC Surface Science, Univ. of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK)

  • G. APAI

    (Analytical Technology Divison, Kodak Research Laboratories, Eastman-Kodak Co., Rochester, NY 14652, USA)

Abstract

Surface phonon spectra in ultrathinα-Al2O3films prepared on metallic substrates show excitation of modes in the frequency range of the surface dipole forbidden ω_-branches according to the dielectric theory of EELS. We compare calculations of thez-polarisation of the FuchsKliewer modes based on lattice dynamics with dielectric theory and semi-microscopic results for a simple NaCl lattice type thin film in the limit ofk→0 appropriate to the dipolar-scattering regime. The form of the primary-beam-energy-dependence of the ω_-branch in thinα-Al2O3films is similar to the lattice dynamics prediction but is of much greater intensity. While the strongk-dependence may be attributed in part to significantz-polarisation of the ω_-branch, mixing with microscopic surface modes seems likely.

Suggested Citation

  • M.B. Lee & B.G. Frederick & G. Apai, 1994. "Dipole Activity And Polarisation Of Surface Phonons In Thin Ionic Films," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 1(04), pages 635-639.
    • Handle: RePEc:wsi:srlxxx:v:01:y:1994:i:04:n:s0218625x94000837
    DOI: 10.1142/S0218625X94000837
    as

    Download full text from publisher

    File URL: http://www.worldscientific.com/doi/abs/10.1142/S0218625X94000837
    Download Restriction: Access to full text is restricted to subscribers
    File URL: https://libkey.io/10.1142/S0218625X94000837?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:wsi:srlxxx:v:01:y:1994:i:04:n:s0218625x94000837. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Tai Tone Lim (email available below). General contact details of provider: http://www.worldscinet.com/srl/srl.shtml .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.