Very recently surface Brillouin scattering from opaque materials and electron energy loss spectroscopy from metallic surfaces with adsorbate were succesfully emplyed to detect surface phonons. We present calculations of surface acoustic phonons in the longwavelength limit for a semi-infinite medium in order to explain the Brillouin cross section. The case of GaAs and Al coated Si are considered. The surface optical phonons that are rapidly decaying in the medium are evaluated with the layer method and the results are compared with the electron energy loss spectra.
Acoustic and Optical Surface Phonons / Bortolani, Virginio; F., Nizzoli; Santoro, Giorgio. - STAMPA. - (1983), pp. 201-214. (Intervento presentato al convegno Ab Initio Calculation of Phonon Spectra tenutosi a Anversa nel September, 1983).
Acoustic and Optical Surface Phonons
BORTOLANI, Virginio;SANTORO, Giorgio
1983-01-01
Abstract
Very recently surface Brillouin scattering from opaque materials and electron energy loss spectroscopy from metallic surfaces with adsorbate were succesfully emplyed to detect surface phonons. We present calculations of surface acoustic phonons in the longwavelength limit for a semi-infinite medium in order to explain the Brillouin cross section. The case of GaAs and Al coated Si are considered. The surface optical phonons that are rapidly decaying in the medium are evaluated with the layer method and the results are compared with the electron energy loss spectra.
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