Adsorption calorimetry on single crystal surfaces: a new technique

An accurate adsorption calorimeter, with good sensitivity to 0.01 monolayers on metal single crystals, has been designed. Simultaneous measurements are made, using a pulsed beam source, of differential heats of adsorption and of sticking probabilities as a function of surface coverage. Results have been obtained for CO and O2 chemisorption, oxide film formation and CO/K coadsorption on {111}, {100} and {110} surfaces of nickel.