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The reaction of 0.89eV Br 2 with a 300K As-rich GaAs(001)-2x4 surface at high coverage has been probed with scanning tunneling microscopy (STM). Although the surface topology is very heterogeneous, our STM images show that most reaction products are arranged along the original dimer rows of the clean surface. Height and lateral registry analysis of the reaction products show that, in some...
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