Abstract
Measurements of electron transmission spectra and work function $\ensuremath{\varphi}$ of a Ni(111) surface held at $T=5.5$ K during exposure to ${\mathrm{O}}_{2}$ provide direct evidence for a precursor adsorption preceding dissociative chemisorption. The form of the electron transmission spectra indicates that the precursor adsorption involves oxygen molecules. Subsequent warming of the oxygen-covered surface leads to the chemisorption state. An analysis of the kinetics of the increase in $\ensuremath{\varphi}$ that accompanies this transition gives an activation energy of \ensuremath{\sim} 13 meV for the reaction.
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