Extensions of Electron Stimulated Desorption Measurements. Investigation of Gas Adsorption on Cu Layers Deposited on a Tungsten (110) Surface

摘要

Work carried out consisted of determining energy thresholds for neutral CO, CO(+), and O(+) from chemisorbed CO on W(110) in electron stimulated desorption. Adsorption of CO and of oxygen on 1-4 Cu layers, adsorbed on a W(110) crystal were studied by thermal desorption and photoelectron spectroscopy. It has been shown that the W substrate influences adsorption behavior for several Cu layers. There are chemical shifts in both CO and Cu indicating an electron drain away from both to the underlying W. For oxygen the sticking coefficient is increased relative to bulk Cu when 1 or 2 Cu layers are adsorbed on W, but then decreases rapidly.