Development of scanning TRAXS and its application to studies of surface dynamics

(1)We have developed a scanning TRAXS combined with UHV-SEM-SREM apparatus，which enables simultaneous analyses of surface chemical compositions and structures of a microscopic region on surfaces.(2)We have studied electromigration phenomena with this new apparatus。A film patch of Ag was deposited on Au-precovered Si(111)surfaces，and then direct current was stressed through the crystals.The spreading ability and migration velocity of the Ag patch were round to sensitively depend on the Au coverages and corresponding surface superstructures。The results are analyzed in terms if surface alloy phase formation and step-edge barriers in migration potential.(3)By using an ability of two-dimensional mapping of surface elements，we have investigated a detection sensitivity of the scanning TRAXS with a sample surface of Ag-covered Si(111)surfaces。The results showed a high sensitivity enough for detecting monolayer Ag.(4)We have studied various surface phases induced by small amounts of Au adsorption on Si(111)-I D83 I D 8X I D 83 I D 8-Ag surface by using the scanning-TRAXS-SEM-SREM method。

(1) We have developed a scanning TRAXS combined with UHV-SEM-SREM apparatus, which enables simultaneous analyses of surface chemical compositions and structures of a microscopic region on surfaces.(2) We have studied electromigration phenomena with this new apparatus. A film patch of Ag was deposited on Au-precovered Si(111) surfaces, and then direct current was stressed through the crystals. The spreading ability and migration velocity of the Ag patch were round to sensitively depend on the Au coverages and corresponding surface superstructures. The results are analyzed in terms if surface alloy phase formation and step-edge barriers in migration potential.(3) By using an ability of two-dimensional mapping of surface elements, we have investigated a detection sensitivity of the scanning TRAXS with a sample surface of Ag-covered Si(111) surfaces. The results showed a high sensitivity enough for detecting monolayer Ag.(4) We have studied various surface phases induced by small amounts of Au adsorption on Si(111)-ィイD83ィエD8 X ィイD83ィエD8-Ag surface by using the scanning-TRAXS-SEM-SREM method.