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Accession Number:
AD0909521
Title:
Inelastic Low-Energy Electron Diffraction Measurements on Al(111)
Descriptive Note:
Technical publication
Corporate Author:
NAVAL WEAPONS CENTER CHINA LAKE CA
Report Date:
1973-03-01
Pagination or Media Count:
19.0
Abstract:
An experimental study has been made of electrons in the energy range 40-80 eV inelastically scattered and diffracted from a clean Al111 surface. The surface is prepared by epitaxial vapor deposition on a Si111 single- crystal surface in ultrahigh vacuum immediately preceding the measurements. The inelastic electron intensity at a given energy loss and angle is obtained as the energy derivative of the amplified electron current from a Faraday collector having a retarding field analyzer and limited angular acceptance. The energy derivative comes from the digitally computed average of a repeatedly measured difference in dc signal accompanying a fixed increment in retarding field. Using this method inelastic angular and loss profiles at 15 degree incidence have been obtained in the vicinity of a Bragg maximum of the 00 elastic beam. The profiles show structure related to the surface and volume plasmon momenta by a two-step model of inelastic diffraction. Dispersion data inferred by applying this model to the loss-before-diffraction structure are compared with results from other sources. The surface plasmon dispersion obtained from inelastic low energy electon diffraction measurements shows promise as a new means of characterizing solid crystalline surfaces.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
