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An account is given of the results of measurements of the contact potential-difference between a tungsten filament and a platinum anode after the latter has been subjected to various treatments. It is shown that a clean platinum surface can be obtained by successive bombardments of the anode with positive ions of oxygen and of argon. The work function of a surface so prepared is found to be in good agreement with the most recent values obtained by thermionic measurements on clean platinum. Values are obtained also for the work functions of oxygen on platinum, hydrogen on platinum, and mixed layers of oxygen and hydrogen on platinum. The bearing of these results on the structure of the mixed layers is discussed.
C.W. Oatley (Wed,) studied this question.
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