Variable-energy photoelectron spectroscopic studies of hydrogen sulfide chemisorption on cuprous oxide and zinc oxide single-crystal surfaces: HS- bonding to copper(I) and zinc(II) sites related to catalytic poisoning

Adsorption of H 2 S in the Cu 2 O(111), ZnO(0001), and ZnO(1010) surfaces has been investigated using variable-energy photoeletron spectroscopy. At room temperature, all surfaces react to form sulfide. At low temperature (140 K) adn low H 2 S coverages (0-0.3 L), H 2 S chemisorbed on the Cu 2 (111) surface is found to completely dissociate, forming sulfide and hydroxide. Under these conditions, the sulfide S 3p photoemission band is observed at 10 eV below the vaccum level, and the S 2p 3/2 and 2p 1/2 core levels lie at 166.4 and 167.6 eV, respectively