DIPOLE ACTIVITY AND POLARISATION OF SURFACE PHONONS IN THIN IONIC FILMS

M.B. Lee, B.G. Frederick and G. Apai
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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

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 635-639

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.

Date: 1994
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DOI: 10.1142/S0218625X94000837

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