Abstract
Thermionic and flow-technique studies of oxygen chemisorption on tungsten ribbons exhibiting (100) planes have shown the presence of three surface states in the range of coverages up to a monolayer (10
15
atom cm
-2
). At coverages up to half a monolayer, the adsorbed state is characterized by a decreasing sticking probability, a low dipole moment, a low activation energy and a low polarizability. The second state (coverages between 5 and 8.5 x l0
14
atom cm
-2
) shows a constant sticking probability, moderate activation energy (20 kJ mole
-1
), high dipole moment and high polarizability. The third state exhibits zero dipole moment. The formation of tungsten oxides is not apparent until coverages of a monolayer have been reached. Under some conditions, thermionic emission in the second state exhibits the unusual phenomenon of a negative Schottky effect.
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