The electronic effect in alloy chemisorption: CO and H2 studies on nickel titanium alloys

Abstract This paper explores the electronic effect in alloys on chemisorption behavior with the examples of CO and H 2 adsorption on Ni Ti alloys. A substantial ionic component in the chemical bonds of the alloy modifies the atoms from their elemental state. Chemisorption of H 2 shows that the compound does not possess the strong hydride formation tendency of titanium and adsorbs hydrogen in two states. CO adsorbs molecularly on Ni 3 Ti at 150 K and near monolayer coverage a 3.4-eV splitting of the 5σ-1π-derived levels is obtained using ultraviolet photoemission spectroscopy. Dissociation of a portion of the CO occurs upon heating to 310 K accompanied by a decrease in splitting of the 5σ-1π levels to ~3.0 eV.