Abstract
The adsorption of molecular and atomic hydrogen on multilayers of potassium, deposited on a tungsten field emitter, and the coadsorption of hydrogen and potassium on tungsten have been investigated by a field-emission technique. Molecular hydrogen does not appear to be chemisorbed on potassium at low temperatures. Atomic hydrogen seems to interact, most probably by the formation of a hydride structure with K atoms outermost from the surface. The coadsorption of H and K on tungsten leads to a decrease in work function over that caused by potassium alone, and to increases in the temperature required for potassium surface diffusion on tungsten. These facts are explained in terms of a surface complex WHK in which H is negatively charged relative to K.
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