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Original Articles

Formation des contours ďextinction par la diffusion inélastique des électrons

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Pages 741-751 | Received 16 Sep 1982, Accepted 25 Nov 1982, Published online: 01 Dec 2006
 

Abstract

Ľhypothèse proposée par Hashimoto (1974) selon laquelle les électrons peuvent étre diffusé inélastiquement dana le cristal soit avant soit après avoir subi une réflexion de Bragg ňeat piw vérifiée expérimentalement dans le cas particulier du dédoubtement des franges ďégale inclinaison. Ce dédoublement doit ětre attribué à des couches parasites aux surfaces de ľéchantillon. Lo modèle qui consiste à traiter le faisceau diffusé inélastiquement comme un faisceau ďélairage divergent permet de rendre compte des observations expérimentales de Iguchi et Hashimota (1981).

Extinction Contours By Inelastic Diffusion of Electrons

By shifting the objective aperture of the electron microscope from the bright-field position to the Bragg reflection dark-field position, Hashimota (1974) observed that the extinction contour fringes split into two. He concluded that the electrons are inelastically scattered either before or after Bragg reflection. However, the experiments reported here show that the splitting is due to the sample parasitic layers. These results can be interpreted using a divergent illumination model of the scattered beam.

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