Abstract
The dissociative chemisorption of iodine and bromine on tungsten single crystal surfaces has been studied by LEED. Iodine adsorption on W(110) produced long chain structures which could be divided into three families of phases (β1, β2 and β3) distinguishable by the arrangement of atoms within the chain. Continuous changes in coverage occurred by sheets of these wellordered chain structures shearing relative to each other to produce packing faults at the resulting shear line. Although bromine on W(110) produced two comparable chain structures, shearing did not occur with changing coverage. Iodine on W(100) failed to produce either chain or shear structures. The lateral adatom interactions responsible for the stability of these structures is discussed.
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