Chlorine adsorption on the low index surfaces of silver: Energetics and structures

The interaction of Cl₂ with Ag single crystal surfaces has been studied over a range of crystal temperature and gas pressure. Observations have been made for the (111), (100) and (110) surfaces. Measured adsorption isobars for Ag(100) were used to obtain isosteric heats of adsorption; values ranged from ~ ?60 kcal/mole (of Cl₂) at low coverage to ~ ?70 kcal/mole near saturation. The structure formed by Cl₂ adsorption on (100) is believed to be a simple overlayer. For (110) and (111) the values obtained for the heat of adsorption were ~ ?55 kcal/mole. On Ag(111) an epitaxially oriented AgCl(111) is believed to form.