Browsing by Author "Wu, MW"

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Chlorine-induced Si surface segregation on the Ge-terminated Si/Ge(100) surface from core-level photoemission
(2001-12-15)
Lin, DS
;
Pan, SY
;
Wu, MW
;
物理研究所
;
Institute of Physics
This study investigated the thermal reactions on the Cl-terminated Si/Ge(100)-2x1 surface using synchrotron radiation photoemission spectroscopy. Populations of surface Cl-Ge and CI-Si bonds during annealing are monitored by measuring the intensities of their corresponding Ge 3d, Si 2p, and Cl 2p core-level components. Experimental results clearly demonstrate that no Si atoms are present on the surface after the deposition of 0.8 monolayer Si on the Ge(100) surface at 730 K and that CI termination pulls out the indiffused Si of about two atomic layers deep to form Cl-Si bonds upon annealing at 550-690 K. We attribute such chlorine induced Si segregation to a thermodynamic driving force that favors the CI-Si surface species. Above 680 K, chlorine is desorbed in the form of SiCl2, although the top surface layer of the starting Si/Ge(100) sample consists of Ge-Ge dimers only.
Open source software development: An overview
(2001-06-01)
Wu, MW
;
Lin, YD
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資訊工程學系
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Department of Computer Science
Although some challenge the value of open source software development, its popularity cannot be disputed. This overview of open source licensing and development models describes some of the movements main principles.